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': 'Regarding otitis necrotics externa all are true except - \nSelect and explain. \nA. Caused by pseudomonas, B. Surgery never done, C. Facial nerve involved, D. Common in diabetics', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]