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': 'True about Rotary NiTi files is \nSelect and explain. \nA. Made by Equiatomic alloy of Ni and Ti, B. Developed by WF Buehlar at Navel ordinance laboratory, C. 45% by weight of Titanium and 55% by wt of Nickle, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]