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': 'True statement \nSelect and explain. \nA. Embryonic peroid : 9-20 weeks, B. Fertilization to implantation : 0-4 weeks, C. Embryonic period : 4-8 weeks, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]