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: Anatomy
[{'content': 'Period of embryo is. \nSelect and explain. \nA. 2-8 weeks, B. 7-36 weeks, C. 37-48 weeks, D. 1-2 weeks', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]