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
Overjet and overbite of malocclusion is assessed using WHO survey from 1997 with the help of the instrument: 
Select and explain. 
A. Williams probe, B. CPI probe, C. Measuring scale, D. Straight probe
B: CPI probe
Answer: B: CPI probe 
Explanation: None