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
Ideal speed for most rotary NiTi Instrument is 
Select and explain. 
A. 300-350 rpm, B. 350-500 rpm, C. 500-600 rpm, D. 100-200 rpm
A: 300-350 rpm
Answer: A: 300-350 rpm 
Explanation: Most endodontic rotary systems are used in the speed range of 300-350 RPM. Light speed is ued at 1200 rpm