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': 'Rat tail file is also known as \nSelect and explain. \nA. Barbed broach, B. R file, C. H file, D. Rasp', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]