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': 'Four numbered instrument formula other than G.M.T. is: \nSelect and explain. \nA. Chistle, B. Hoe, C. Angle former, D. Hatchet', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]