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': "Bristow elevator is used in: \nSelect and explain. \nA. Gillies approach., B. Keen's technique., C. Both of the above., D. None.", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]