This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Which of the following is not a typical feature of malignant otitis externa? \nSelect and explain. \nA. Caused by Pseudomonas aeruginosa, B. Patients are usually old, C. Mitotic figures are high, D. Patient is immune compromised', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Malignant otitis externa is not a neoplastic disease. The term malignant is used because of the severity of disease which can cause several complications including multiple cranial nerve palsies. Malignant otitis externa is an infective process caused mostly by P aeruginosa. It affects elderly diabetics or those with immunocompromised status.', 'role': 'assistant'}]