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
[{'content': 'The cranial nerve most commonly involved in malignant otitis externa is? \nSelect and explain. \nA. 3rd, B. 4th, C. 6th, D. 7th', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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. Facial paralysis is common. (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 55)', 'role': 'assistant'}]