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': 'For a 8 year old child with TMJ ankylosis, the treatment of choice is \nSelect and explain. \nA. Gap arthroplasty, B. Condylectomy, C. Gap arthroplasty with costochondral grafting, D. Treatment not required', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]