The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 32-year-old primigravid woman at 16 weeks' gestation comes to the physician for a routine prenatal visit. She is asymptomatic and has no history of serious illness. Her only medication is a prenatal vitamin. Her temperature is 37.2°C (99°F) and blood pressure is 108/60 mm Hg. Pelvic examination shows a uterus consistent in size with a 16-week gestation. A quadruple screening test shows maternal serum AFP of 3 times the median and normal levels of serum β-hCG, estriol, and inhibin A. Which of the following is most likely to account for these findings?   (A) Partial molar pregnancy   (B) Neural tube defect   (C) Trisomy 18   (D) Trisomy 21
['(B) Neural tube defect <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Partial molar pregnancy \n (B) Neural tube defect \n (C) Trisomy 18 \n (D) Trisomy 21 <> possible answers', "  A 32-year-old primigravid woman at 16 weeks' gestation comes to the physician for a routine prenatal visit. She is asymptomatic and has no history of serious illness. Her only medication is a prenatal vitamin. Her temperature is 37.2°C (99°F) and blood pressure is 108/60 mm Hg. Pelvic examination shows a uterus consistent in size with a 16-week gestation. A quadruple screening test shows maternal serum AFP of 3 times the median and normal levels of serum β-hCG, estriol, and inhibin A. Which of the following is most likely to account for these findings? <> context@"]