This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'A child has adenoidectomy done but he has effusion in the middle ear. What is done next \nSelect and explain. \nA. Grommet inseion, B. Mastoidectomy, C. Tympanoplasty, D. Tonsillectomy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Effusion in the middle ear(serous otitis media)treated with myringotomy and aspiration of fluid and grommet inseion to provide continued aeration of the middle ear. Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 70', 'role': 'assistant'}]