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: A

Rationale: The correct answer is A: Symptom are absent and abnormal specific laboratory results. Chemical diabetes mellitus refers to a condition where there are abnormal specific laboratory results indicating diabetes without the presence of any symptoms. This classification is based on objective data from laboratory tests rather than subjective symptoms. Choices B, C, and D are incorrect as they do not align with the definition of chemical diabetes mellitus, which focuses on laboratory results rather than symptoms, congenital abnormalities, or pregnancy outcomes.

Correct Answer: A

Rationale: The correct answer is A: Immediate caesarean section. In obstructed labor, prompt delivery is crucial to prevent harm to both the mother and the baby. A caesarean section is the most effective and timely intervention to safely deliver the baby and avoid complications such as fetal distress, maternal infection, and uterine rupture. Observation with pain relief (B) may delay necessary intervention, and manual repositioning of the fetus (C) is not sufficient in cases of obstructed labor. Choice D is incorrect because not all options are appropriate in this specific scenario.

Correct Answer: D

Rationale: The correct answer is D because exchange transfusion aims to control hemolysis by removing the damaged red blood cells and replacing them with healthy ones, thus restoring hemoglobin levels. This procedure does not cure haemolysis or hypoxia entirely, nor does it stabilize the immune system or liver functions. It specifically targets controlling hemolysis and restoring hemoglobin levels to improve the patient's condition.

Correct Answer: C

Rationale: The correct answer is C: Majority are classified as secondary face presentation. In face presentation, the fetal head is hyperextended, presenting the face to the birth canal. Primary face presentation is rare. The bi-parietal diameter is not the presenting diameter in face presentation, as it is in vertex presentation. Locating the anterior fontanelle is not diagnostic of face presentation, as the fontanelles can be difficult to palpate during labor. Therefore, the correct statement is that the majority of face presentations are classified as secondary face presentation.