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: Dental
[{'content': 'The best bone graft which can be utilized for reconstruction is: \nSelect and explain. \nA. Costo chondral graft, B. Calvarial graft, C. lilac crest graft, D. Metatarsal bone graft', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]