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': 'Origin and migration of cell population during embryonic craniofacial development \nSelect and explain. \nA. 0-18 days, B. 19 to 28 days, C. 29 to 38 days, D. 39-55 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]