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': 'The most suitable instrument to remove gutta percha from the root canal is \nSelect and explain. \nA. barbed broach, B. peeso reamer, C. tapering fissure bur, D. round bur', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]