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 three types of abrasives used in dentistry can be classified as the following EXCEPT: \nSelect and explain. \nA. Polishing abrasives, B. Finishing abrasives, C. Bleaching abrasives, D. Cleansing abrasives', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]