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': 'Use of an acrylated arch bars for closed reduction of mandible was described by \nSelect and explain. \nA. Schuchardt(1956), B. Risdon (1929), C. Stanstout (1943), D. Leonard (1977)', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]