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': 'Gracey curette No. 11-12 are used for \nSelect and explain. \nA. Anterior teeth, B. Posterior teeth mesial, C. Posterior teeth distal, D. Posterior teeth facial and lingual', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]