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
Skull base osteomyelitis is 
Select and explain. 
A. Otomycosis, B. Tumor of the Ear, C. Malignant Otitis Externa, D. Chronic serous Otitis Media
C: Malignant Otitis Externa
Answer: C: Malignant Otitis Externa 
Explanation: None