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': 'The instrument shown here is useful for: \nSelect and explain. \nA. To condense amalgam, B. For vital bleaching, C. Removal of crown, D. Removal of broken instrument', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]