This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology, Subject name: Anatomy
[{'content': 'Defect seen due to failure of closure of rostral part of neural tube or cranial neuropore? \nSelect and explain. \nA. Anencephaly, B. Spina bifida, C. Meningocele, D. Sacrococcygeal teratoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. AnencephalyAnencephaly is the absence of a major portion of the brain, skull, and scalp that occurs during embryonic development. It is a cephalic disorder that results from a neural tube defect that occurs when the rostral (head) end of the neural tube fails to close, usually between the 23rd and 26th day following conception.', 'role': 'assistant'}]