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: Gynaecology & Obstetrics
[{'content': 'Aipha fetoproteins are not increased in : \nSelect and explain. \nA. Spina bifida, B. Post maturity, C. Esophageal atresia, D. Anencephaly', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Post maturity', 'role': 'assistant'}]