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': 'Malignant otitis externa is due to? \nSelect and explain. \nA. Wax impaction, B. Hypeension, C. Diabetes, D. Dyslipidemia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: It is an inflammatory condition caused by Pseudomonas infection, usually in the elderly diabetics, or in those on immunosuppressive drugs. There will be excruciating pain and granulations in the ear canal. (Ref: Textbook of diseases if ENT, PL Dhingra, 7th edition, pg no. 55)', 'role': 'assistant'}]