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
Crown completion of Maxillary 3rd molar occur 
Select and explain. 
A. 12-18 years, B. 1 ½ year, C. 2 ½ to 3 year, D. 14-16 years
A: 12-18 years
Answer: A: 12-18 years 
Explanation: None