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
Regarding otitis necrotics externa all are true except - 
Select and explain. 
A. Caused by pseudomonas, B. Surgery never done, C. Facial nerve involved, D. Common in diabetics
B: Surgery never done
Answer: B: Surgery never done 
Explanation: None