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
The community periodontal index of treatment needs is recorded for: 
Select and explain. 
A. Quadrants, B. Sextants, C. One arch, D. Whole dentition
B: Sextants
Answer: B: Sextants 
Explanation: None