This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
[{'content': 'Oral anticoagulants given to pregnant women can cause \nSelect and explain. \nA. Long bones limb defect, B. Craniofacial malformation, C. CVS malformation, D. Costo chondrodysplasia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]