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': 'The earliest symptom of acoustic nerve tumor is - \nSelect and explain. \nA. Sensorineural hearing loss, B. Tinnitus, C. Vertigo, D. Otorrhea', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]