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': 'Example of slow speed rotary stainless steel instruments: \nSelect and explain. \nA. GG drill and Peeso reamer, B. Nickel-titanium rotary instruments, C. Reciprocating handpiece, D. Vertical stroke handpiece', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rotary Endodontic instrument used with a Handpiece\xa0\nThey can be further subdivided into:\n\nSlow-speed rotary stainless steel instruments\xa0 eg. Gates gliden drill, peeso reamer\nNickel-titanium rotary instrument.\n\nTextbook of Endodontics Nisha GARG 3rd ED', 'role': 'assistant'}]