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
Which of the following Gracey curette is used for both anterior teeth and premolars 
Select and explain. 
A. 1-2; 3-4, B. 6-May, C. 7-8; 9-10, D. 12-Nov
B: 6-May
Answer: B: 6-May 
Explanation: None