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': 'Most preferable graft for mandibular reconstruction: \nSelect and explain. \nA. Graft from anterior illiac crest., B. Costochondral graft., C. Fibula graft, D. Any of the above.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]