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': 'The long winter elevators (Nos. 14R and 14L) were designed for the removal of \nSelect and explain. \nA. Mandibular molar roots, B. Mandibular incisor roots, C. Mandibular canine roots, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]