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': 'Peso reamer is used for: \nSelect and explain. \nA. To remove lingual shoulder of anterior teeth, B. To enlarge root canal orifices, C. Post space preparation, D. to remove guttapercha', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]