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 Mandibular 2nd molar occur at 
Select and explain. 
A. 11-12 year, B. 12-13 year, C. 14-15 year, D. 13-15 year
B: 12-13 year
Answer: B: 12-13 year 
Explanation: None