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': 'Which of the following is the earliest symptom of acoustic neuroma? \nSelect and explain. \nA. Deafness, B. Tinnitus, C. Veigo, D. Facial weakness', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The earliest symptom of many patients with acoustic neuroma is mild unilateral sensorineural hearing loss. Tinnitus is common, veigo may or may not be present. Acoustic neuromas arise predominantly from the superior half of the vestibular poion of the vestibulocochlear nerve. Very large tumors may cause brain stem compression and obstructive hydrocephalus.', 'role': 'assistant'}]