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 gentleman of age 70 yrs, presents with complaints of tinnitus which is constant with a high buzzing pitch. Most probable diagnosis is: \nSelect and explain. \nA. Acoustic neuroma, B. ASOM, C. Labyrinthitis, D. Acoustic trauma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]