This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Eustachian Tube, Subject name: ENT
[{'content': 'U/L non-suppurative Otitis media in adults is due to: \nSelect and explain. \nA. Allergic rhinitis, B. URTI, C. Trauma, D. Malignancy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (d) Malignancy(Ref. Scott Brown, 8th ed., Vol 2; 973)Any adult presenting with U/L non-suppurative Otitis media should be investigated for nasopharyngeal carcinoma which might be obstructing that particular side Eustachian tube.If serous Otitis media occurs because of overproduction of middle ear fluid due to allergy, it will be bilateral.URTI may lead to ASOM.Trauma does not lead to Serous Otitis media.', 'role': 'assistant'}]