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
[{'content': 'Ideal speed for most rotary NiTi Instrument is \nSelect and explain. \nA. 300-350 rpm, B. 350-500 rpm, C. 500-600 rpm, D. 100-200 rpm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most endodontic rotary systems are used in the speed range of 300-350 RPM. Light speed is ued at 1200 rpm', 'role': 'assistant'}]