Vaginal delivery is possible in

Correct Answer: B

Rationale: The correct answer is B: Face presentation. Vaginal delivery is possible in face presentation as the fetus is in a position where the face is presenting first, allowing for delivery. In this presentation, the chin is usually tucked onto the chest, making it easier for the baby's head to pass through the birth canal. A: Brow presentation is incorrect because it indicates the baby's head is extended slightly, making it more difficult for vaginal delivery. C: Shoulder presentation is incorrect as it can lead to a shoulder dystocia, making vaginal delivery dangerous and difficult. D: Unstable lie is incorrect because it refers to the baby being in a transverse position, making vaginal delivery impossible without intervention.

Correct Answer: A

Rationale: The correct answer is A: They are always of the same sex. This is because monozygotic twins, also known as identical twins, develop from a single fertilized egg that splits into two embryos. As a result, they share the same genetic material and are always of the same sex. Choice B is incorrect because fingerprint patterns are not determined by genetics and can vary even between identical twins. Choice C is incorrect because monozygotic twins share the same blood type since they have the same genetic makeup. Choice D is incorrect as superfetation, the occurrence of multiple pregnancies in the same uterus but from different ovulations, is extremely rare and not a common finding in monozygotic twins.

Correct Answer: C

Rationale: The correct answer is C: Not more than two previous caesarean section scars. This is because a trial of scar refers to a trial of labor in a woman who has had previous cesarean sections. The guideline typically recommends that a trial of scar should be considered in women with no more than two previous cesarean section scars to reduce the risk of uterine rupture. Choices A, B, and D are incorrect because the estimated fetal weight, availability of a level one hospital, and pelvis size are not specific criteria used to determine eligibility for a trial of scar.

Correct Answer: A

Rationale: Step-by-step rationale: 1. Precipitate labor is defined as unusually rapid labor. 2. Option A states that it is concluded in less than three hours, aligning with the definition. 3. Option B talks about cervical dilation, which is not a defining factor of precipitate labor. 4. Option C contradicts the definition as it mentions a duration longer than three hours. 5. Option D mentions poor uterine contractions, which are not characteristic of precipitate labor. Summary: Option A is correct because it aligns with the definition of precipitate labor being rapid, while the other options are incorrect as they do not accurately describe the characteristics of precipitate labor.

Correct Answer: A

Rationale: The correct answer is A because signs of obstructed labor include a dry vagina due to prolonged pressure, oedema of the cervix due to prolonged contractions, and caput succedaneum which is swelling of the baby's scalp from prolonged pressure. Choice B is incorrect because plenty of amniotic fluid is not a sign of obstructed labor. A hot/dry vagina is not a typical sign of obstructed labor. Meconium-stained liquor can be a sign of fetal distress, but not specifically obstructed labor. Choice C is incorrect because meconium-stained liquor is a sign of fetal distress, not necessarily obstructed labor. A hot/dry vagina is not a typical sign of obstructed labor. Diluted urine is not a typical sign of obstructed labor. Choice D is incorrect because while caput succedaneum is a sign of obstructed labor, oedema of the cervix is more indicative of obstructed labor than plenty of amni