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
[{'content': 'True statement about malignant otitis externa is - \nSelect and explain. \nA. Not painful, B. Common in diabetics and old age, C. Caused by streptococcus, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]