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': 'Which of the following Gracey curette is used for both anterior teeth and premolars \nSelect and explain. \nA. 1-2; 3-4, B. 6-May, C. 7-8; 9-10, D. 12-Nov', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]