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': 'A case of CSOM presenting with vertigo can have any of the following except - \nSelect and explain. \nA. Dural separation, B. Cerebellar abscess, C. Fistula with semicircular canal, D. Any of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]