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': 'Chance of subsequent baby having NTD when first baby was born with NTD - \nSelect and explain. \nA. 2%, B. 4%, C. 10%, D. 20%', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 4%The recurrence risk of neural tube defect is :3 - 5 % if a couple has previously had a child with either anencephaly or spina bifida.5% if either parent was born with a NTD.10% if a couple has two affected children", 'role': 'assistant'}]