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': 'Not a cause of objective tinnitus ? \nSelect and explain. \nA. Palatal myoclonus, B. Glomus tumor, C. Carotid aery aneurysm, D. Presbyacusis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Presbyacusis Tinnitus Tinnitus is ringing sound or noise in the ear. The characteristic feature is that the origin of this sound is within the patient.", 'role': 'assistant'}]