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
Mobility of teeth is measured using: 
Select and explain. 
A. Periodontometer, B. Periotron, C. Spechtometer, D. Densitometer
A: Periodontometer
Answer: A: Periodontometer 
Explanation: None