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': 'Procedure for serous otitis media is - \nSelect and explain. \nA. Tympanoplasty, B. Mastoidectomy, C. Myringotomy, D. Medical treatment', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Myringotomy with grommet insertion is the most common procedure used to treat SOM.', 'role': 'assistant'}]