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
1st evidence of calcification of Upper central incisor is seen in 
Select and explain. 
A. 3-4 months, B. 6-7 months, C. 8-9 months, D. 1-2 months
A: 3-4 months
Answer: A: 3-4 months 
Explanation: None