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': 'A 18-month-old boy is brought by parents to his family physician with a 2-day history of fever, irritability, and frequent tugging of his left ear. The physician diagnoses acute otitis media and treated with antibiotics. In follow-up 2 months later, otoscopic examination, air-fluid levels are seen in the left ear. Medical management is failed to resolve the effusion. Treatment of choice in this child is: \nSelect and explain. \nA. Conservative, B. Tympanoplasty, C. Myringotomy with ventilation tube inseion, D. Myringotomy with diode laser', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Surgical measures of serous otitis media: Myringotomy and aspiration of fluids Grommet inseion Tympanotomy or coical mastoidectomy Surgical treatment of causative factor', 'role': 'assistant'}]