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': 'Orthognathic decompensation is done: \nSelect and explain. \nA. Is done at the time of surgery, B. Is done before the surgery, C. Is done after the surgery, D. Nature itself decom pensate or dental compensation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]