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': "Hazard of chorionic vinous biopsy is : \nSelect and explain. \nA. Limb abnormality, B. Spina bifida, C. Down's syndrome, D. Aboion", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Aboion', 'role': 'assistant'}]