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
Period of embryo is. 
Select and explain. 
A. 2-8 weeks, B. 7-36 weeks, C. 37-48 weeks, D. 1-2 weeks
A: 2-8 weeks
Answer: A: 2-8 weeks 
Explanation: None