The commonest causative organism of pyelonephritis is

Correct Answer: D

Rationale: The correct answer is D: Escherichia coli. E. coli is the most common causative organism of pyelonephritis due to its prevalence in the gastrointestinal tract. It has specific virulence factors that enable it to ascend the urinary tract and cause infection. Streptococcus faecalis, Proteus vulgaris, and Staphylococcus pyogene are less commonly associated with pyelonephritis compared to E. coli.

Correct Answer: D

Rationale: Non-infective mastitis is associated with adenitis because it refers to inflammation of breast tissue without an infection. Adenitis specifically involves inflammation of the lymph nodes, which can be a common cause of non-infective mastitis. Cellulitis (A) is an infection of the skin and tissues beneath the skin, not specific to mastitis. Flat (B) and bifid (C) nipples are anatomical variations that do not directly relate to the inflammation of breast tissue.

Correct Answer: C

Rationale: The correct answer is C: Multiple gestation. Preterm birth is more common in multiple gestation pregnancies due to the increased strain on the mother's uterus and cervix. This can lead to early labor and delivery. Social habits (choice A) and genetic factors (choice B) may play a role in preterm birth but are not highly associated. Chronic conditions (choice D) can also contribute to preterm birth, but multiple gestation is a stronger predictor.

Correct Answer: B

Rationale: The correct answer is B: Face presentation. Vaginal delivery is possible in face presentation as the baby's head is extended, allowing for descent through the birth canal. Brow presentation (A) and shoulder presentation (C) may require cesarean delivery due to the atypical presentation of the baby. Unstable lie (D) refers to the baby being in a transverse position, which also necessitates a cesarean section. Face presentation is the only option where vaginal delivery may be possible due to the extended position of the baby's head.

Correct Answer: A

Rationale: The correct answer is A because an acute small for gestational age neonate will have all body parts proportionately reduced in size compared to a normal gestational age baby. This is due to intrauterine growth restriction. Choice B is incorrect because the head is not disproportionately larger. Choice C is incorrect as it states the body is larger than the head, which is not the case in SGA babies. Choice D is incorrect as SGA babies typically appear thin with a scaphoid abdomen, not plumpy.

Correct Answer: C

Rationale: The presenting diameter in brow presentation is the suboccipitofrontal diameter. This is because in brow presentation, the fetal head is in a deflexed position, with the largest diameter being from the subocciput (back of the head) to the frontal bone (forehead). This allows the head to enter the pelvis in the transverse diameter. A: Mentovertical - This refers to the chin to the top of the head, not the correct diameter for brow presentation. B: Submentobregmatic - This refers to the chin to the bregma, not the correct diameter for brow presentation. D: Occipitalfrontal - This refers to the back of the head to the forehead, not the correct diameter for brow presentation.

Correct Answer: B

Rationale: Step 1: Hyperemesis gravidarum is characterized by severe nausea and vomiting during pregnancy. Step 2: Inability to eat or retain food all through is a hallmark feature due to excessive vomiting. Step 3: This leads to dehydration, electrolyte imbalances, and weight loss. Step 4: Pallor, cyanosis, weakness, and smaller fundal height are not specific to hyperemesis gravidarum. Summary: Choice B is correct as it directly relates to the primary symptom of excessive vomiting in hyperemesis gravidarum, while the other choices are not specific to this condition.

Correct Answer: A

Rationale: The correct answer is A: Submentovertival, bitemporal. In a face presentation, the presenting diameters are submentovertival (chin to vertex) and bitemporal (temple to temple). This is because the fetus is in a face-first position with the chin presenting first. Option B is incorrect because submentobregmatic is not a recognized presenting diameter in face presentation. Option C is incorrect as biparietal refers to the widest transverse diameter of the fetal head, not relevant in face presentation. Option D is incorrect as mentovertical is not a valid presenting diameter in face presentation.

Correct Answer: A

Rationale: The correct answer is A: Continue the current regimen. Spironolactone is a potassium-sparing diuretic commonly used to treat ascites. The weight loss of 0.75 kg/day indicates that the current regimen is effective. Continuing the regimen is appropriate to avoid electrolyte imbalances. Discontinuing spironolactone (Choice B) can lead to rebound edema. Adding a loop diuretic (Choice C) may increase the risk of electrolyte disturbances. Large-volume paracentesis (Choice D) is reserved for cases of refractory ascites.