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
A non-invasive way of evaluating implant stability by impact resistance 
Select and explain. 
A. Periotest, B. Transgingival probing, C. Bone sounding, D. Probing
A: Periotest
Answer: A: Periotest 
Explanation: None