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
Surface roughness of an orthodontic mini-screw implant can be measured by: 
Select and explain. 
A. Gyrometer, B. Androidometer, C. Profilometer, D. Resonance analyzer
C: Profilometer
Answer: C: Profilometer 
Explanation: The quality of the surface finish and polish can be characterized by the measurement of the surface roughness using a profilometer, an optical microscope or an SEM.
Reference: Phillips 12th ed page no 236