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
Malignant otitis externa is due to? 
Select and explain. 
A. Wax impaction, B. Hypeension, C. Diabetes, D. Dyslipidemia
C: Diabetes
Answer: C: Diabetes 
Explanation: 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)