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 probing pressure applied by CPITN probe 
Select and explain. 
A. 10 grams, B. 25 grams, C. 35 grams, D. 45 grams
B: 25 grams
Answer: B: 25 grams 
Explanation: None