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: Pediatrics
[{'content': "Risk of Down's syndrome in Elderly (>35 years) \nSelect and explain. \nA. 1% - 2%, B. 1% - 4%, C. 2% - 4%, D. 1% - 5%", 'role': 'user'}, {'content': "Answer: B \nExplanation: Risk of Down's syndrome in Elderly (>35 Years) is 1% - 4%.", 'role': 'assistant'}]