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 Mandibular 2nd molar is seen in 
Select and explain. 
A. At birth, B. 1 ½ year, C. 9 months after birth, D. 2 ½- 3 year
D: 2 ½- 3 year
Answer: D: 2 ½- 3 year 
Explanation: None