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
True statement about malignant otitis externa is - 
Select and explain. 
A. Not painful, B. Common in diabetics and old age, C. Caused by streptococcus, D. All of the above
B: Common in diabetics and old age
Answer: B: Common in diabetics and old age 
Explanation: None