This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Surgery
[{'content': 'An elderly man complains of ear pain. During evaluation, the physician asks if the patient has tinnitus. What is tinnitus? \nSelect and explain. \nA. A subjective sensation of noise in the head, B. A complication of chronic metal ingestion, C. An audible cardiac murmur, D. Dizziness with sounds', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tinnitus is the perception of abnormal noise in the ear or head. It is usually attributed to a sensory loss; pulsatile tinnitus occurs with conductive hearing loss and is due to carotid pulsations becoming more apparent.', 'role': 'assistant'}]