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: D

Rationale: Correct Answer: D. Some form of vagotomy Rationale: 1. Vagotomy is a surgical procedure that involves cutting the vagus nerve to reduce acid production in the stomach, which can help in treating ulcers. 2. Vagotomy is often recommended when ulcers are refractory to medical therapy, making it an appropriate surgical option. 3. Lifelong vitamin D replacement (A) is not typically necessary for ulcer treatment. Excision of the ulcer (B) is not a common treatment and does not address the underlying cause. Eating smaller meals (C) may help manage symptoms but is not a surgical option for refractory ulcers.

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 gestational diabetes can lead to macrosomia, which is excessive fetal growth due to high blood sugar levels in the mother. This occurs as the fetus receives excess glucose from the mother, resulting in increased fat deposition and larger birth weight. Congenital anomalies (B) are not directly caused by gestational diabetes but by genetic or environmental factors. Reduced fetal movements (C) are not a typical effect of gestational diabetes. While gestational diabetes can increase the risk of preterm birth (D), the primary impact on fetal development is macrosomia.

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.