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: Dental
First evidence of initiation of primary dentition is
usually around: 
Select and explain. 
A. 4 months in utero, B. Birth, C. 4 months after birth, D. One year after birth
A: 4 months in utero
Answer: A: 4 months in utero 
Explanation: None