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
Furcation is measured by 
Select and explain. 
A. Naber's probe, B. Fluoride probe, C. Miller's probe, D. CPITN probe
A: Naber's probe
Answer: A: Naber's probe 
Explanation: None