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': 'A patient with oral cancer involving mandible is managed by: \nSelect and explain. \nA. Chemotherapy alone, B. Radiotherapy alone, C. Resection followed by radiotherapy, D. Radiotherapy followed by resection', 'role': 'user'}, {'content': 'Answer: C \nExplanation: When ever Mandible is involved, resection is done before radiotherapy. If radiotherapy is given first it can lead to radionecrosis of Mandible.', 'role': 'assistant'}]