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
Rapid maxillary expansion is not indicated after: 
Select and explain. 
A. 6 years, B. 9 years, C. 12 years, D. 15 years
D: 15 years
Answer: D: 15 years 
Explanation: None