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
Group function occlusion is common in: 
Select and explain. 
A. 10-14 years, B. 15-25 years, C. Above 30 years, D. Edentulous patients
C: Above 30 years
Answer: C: Above 30 years 
Explanation: None