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': 'Ultrahigh-speed rotary cutting tools rotate at \nSelect and explain. \nA. <60,000 rpm, B. 60,000-3,00,000 rpm, C. 3,00,000-5,00,000 rpm, D. > 5,00,000 rpm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]