This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnostic and operative ENT, Subject name: ENT
[{'content': 'Commonest cause for grommet inseion is \nSelect and explain. \nA. Secretory otitis media, B. Otosclerosis, C. CSOM, D. Cholesteatoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The main pathology in Serous otitis media is effusion, which can be managed by drainage. Inseion of grommet in infection can lead to foreign body granuloma. www.mydr.com.au Tympanostomy tube, also known as a grommet or myringotomy tube, is a small tube inseed into the eardrum in order to keep the middle ear aerated for a prolonged period of time, and to prevent the accumulation of fluid in the middleear. Re: Textbook of Ear, Nose and Throat, Dhingra, 6th Edition; Pg no: 396', 'role': 'assistant'}]