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': 'Instrument used for lateral condensation of guttapercha along the canal wall \nSelect and explain. \nA. Barbed broach, B. Plugger, C. Reamer, D. Spreader', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]