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': 'What is the limit of eccentricity of an air rotor bur, beyond which it stops working \nSelect and explain. \nA. 0.01, B. 0.02, C. 0.03, D. 0.04', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]