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: ENT
[{'content': 'Skull base osteomyelitis is \nSelect and explain. \nA. Otomycosis, B. Tumor of the Ear, C. Malignant Otitis Externa, D. Chronic serous Otitis Media', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]