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
Origin and migration of cell population during embryonic craniofacial development 
Select and explain. 
A. 0-18 days, B. 19 to 28 days, C. 29 to 38 days, D. 39-55 days
B: 19 to 28 days
Answer: B: 19 to 28 days 
Explanation: None