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 CPITN probe was designed for the detection of 
Select and explain. 
A. Supragingival calculus, B. Debris, C. Subgigival calculus, D. Subgigival stains
C: Subgigival calculus
Answer: C: Subgigival calculus 
Explanation: None