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': 'Sequence of endodontic instrumentation \nSelect and explain. \nA. Broach-reamer-file, B. Reamer-Broach-file, C. File-Reamer-Broach, D. File-broach-reamer', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]