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: Surgery
[{'content': 'Mainly elevators in exodontia works on the principle of \nSelect and explain. \nA. Lever I., B. Lever I & II., C. Lever III, D. Wedge', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]