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 maxillary 2nd molar is seen in 
Select and explain. 
A. 2 year, B. 2 ½ to 3 year, C. 7-8 year, D. At birth
B: 2 ½ to 3 year
Answer: B: 2 ½ to 3 year 
Explanation: None