Mallory-Weiss syndrome is a complication of

Correct Answer: D

Rationale: Mallory-Weiss syndrome is caused by severe vomiting leading to tears in the esophagus. Hyperemesis gravidarum is severe nausea and vomiting during pregnancy, which can result in Mallory-Weiss syndrome. Placenta praevia, cardiac disease, and postpartum hemorrhage are not directly associated with Mallory-Weiss syndrome.

Correct Answer: B

Rationale: The correct answer is B: Placental bed. Malaria parasites hide in the placental bed during pregnancy to avoid detection by the immune system. This location provides a safe haven for the parasites to survive and replicate without being cleared by the mother's immune response. The placental bed offers a rich blood supply and a favorable environment for the parasites to thrive. Incorrect choices: A: Bone marrow - Malaria parasites do not typically hide in the bone marrow during pregnancy. C: Fetal circulation - Malaria parasites do not hide in the fetal circulation; they primarily reside in the placental bed. D: Uterine muscle - Malaria parasites do not hide in the uterine muscle; the placental bed is the main site of sequestration during pregnancy.

Correct Answer: B

Rationale: The correct answer is B: Sweeping of membranes and amniotomy. 1. Sweeping of membranes involves manually separating the amniotic sac from the lower part of the uterus, stimulating the release of prostaglandins to induce labor. 2. Amniotomy is the artificial rupture of membranes, which can accelerate labor by releasing amniotic fluid and initiating contractions. 3. These methods are commonly used for surgical induction of labor due to their effectiveness and minimal invasiveness compared to other options. Incorrect choices: A: Cytotec is a medication used for labor induction, but mechanical cervical dilatation is not a standard surgical method. C: Buscopan is used for relaxation of smooth muscle and not commonly used for labor induction. D: Syntocinon is a synthetic form of oxytocin used to induce or augment labor, but it is not typically used in surgical induction methods.

Correct Answer: A

Rationale: The correct answer is A: Always of the same sex. Monozygotic twins develop from a single fertilized egg, so they have the same genetic material, making them always the same sex. This is due to the fact that the sex of an individual is determined by the chromosomes inherited from the parents. This is a fundamental principle of genetics. Choices B, C, and D are incorrect because monozygotic twins can have different fingerprints, blood groups, and superfetation (conception that occurs during an existing pregnancy) is not common in monozygotic twins.

Correct Answer: B

Rationale: The correct answer is B (3000 ml) because polyhydramnios is defined as an excessive amount of amniotic fluid, typically exceeding 2000-2500 ml. A level of 3000 ml is commonly used as a cutoff point for clinical diagnosis. Choices A, C, and D are incorrect because they fall below the threshold typically considered diagnostic for polyhydramnios. Answer A (1500 ml) is too low, while choices C (1900 ml) and D (2500 ml) are below or at the lower end of the range typically associated with polyhydramnios. Therefore, the most appropriate threshold for diagnosing polyhydramnios is when the amount of amniotic fluid exceeds 3000 ml.