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: Radiology
[{'content': 'Amniocentesis is done at \nSelect and explain. \nA. 12 - 14 weeks, B. 14 - 16 weeks, C. 8 - 10 weeks, D. 18 - 20 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Amniocentesis\xa0normally done at 14 - 16 weeks.\nEarly Amniocentesis 12 - 14 week.', 'role': 'assistant'}]