This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': '|ed maternal serum a-FP is seen in : \nSelect and explain. \nA. Multiple pregnancy, B. Trisomy 21, C. Open neural tube defect, D. IUD', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b i.e. Trisomy 21Low levels of MSAFP (Maternal serum alpha feto protein) are seen in :Chromosomal trisomyGestational trophoblastic diseasesBlighted ovumIncreased maternal weightOverestimated gestational age.', 'role': 'assistant'}]