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
The first evidence of calcification of primary anterior teeth begins approximately between: 
Select and explain. 
A. 14 to 17 weeks in utero, B. 9 to 12 weeks in utero, C. 6 to 9 weeks in utero, D. 17 to 20 weeks in utero
A: 14 to 17 weeks in utero
Answer: A: 14 to 17 weeks in utero 
Explanation: None