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': '18-30 fluted carbide but is used for: \nSelect and explain. \nA. Finishing, B. Polishing, C. Grinding, D. Contouring', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]