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
Eruption of Maxillary 2nd molar occur at 
Select and explain. 
A. 8-9 year, B. 10-11 year, C. 19-20 year, D. 12-13 year
D: 12-13 year
Answer: D: 12-13 year 
Explanation: None