Correct Answer: D

Rationale: The correct answer is D: All of the above. Ultrasound in monitoring fetal growth can detect fetal anomalies by visualizing the fetus in real-time. It can also monitor placental health by assessing blood flow and position. Additionally, ultrasound can assess amniotic fluid levels to ensure proper fetal development. Therefore, all the benefits mentioned in choices A, B, and C are valid reasons why ultrasound is essential in monitoring fetal growth.

Correct Answer: D

Rationale: The correct answer is D: All of the above. Ultrasound in monitoring fetal growth can detect fetal anomalies by visualizing the fetus in real-time. It can also monitor placental health by assessing blood flow and position. Additionally, ultrasound can assess amniotic fluid levels to ensure proper fetal development. Therefore, all the benefits mentioned in choices A, B, and C are valid reasons why ultrasound is essential in monitoring fetal growth.

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: A

Rationale: The correct answer is A because cord presentation occurs when the umbilical cord lies in front of the presenting part after the membranes have ruptured. This can lead to compression of the cord during labor, affecting fetal oxygenation. Option B is incorrect as it describes cord prolapse, where the cord lies in front of the presenting part before membrane rupture. Option C describes nuchal cord, where the cord is wrapped around the fetal neck. Option D describes cord abruption, where the cord detaches prematurely from the placenta.

Correct Answer: B

Rationale: The correct answer is B: Transient rebound release of remaining pituitary hormones. After surgical removal of the ACTH-producing pituitary tumor in Cushing's syndrome, there may be a transient rebound release of remaining pituitary hormones due to relief of negative feedback from the tumor. This can lead to a temporary increase in pituitary hormone levels before normalization. Rationale: 1. Rapid reversal of symptoms with good pituitary function (Choice A) is less likely as it takes time for the pituitary gland to recover and resume normal hormone production post-surgery. 2. Markedly improved dexamethasone suppression test (Choice C) is not expected immediately after surgery as it may take time for the hypothalamic-pituitary-adrenal axis to normalize. 3. Hyponatremia and compensatory SIADH (Choice D) are unlikely post-operatively in Cushing's syndrome as removal of the ACTH-producing tumor should lead to normalization of