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
A-7 year child presenting with acute otitis media, does not respond to ampicillin. Examination reveals full and bulging tympanic membrane, the treatment of choice is: 
Select and explain. 
A. Sytemic steroid, B. Ciprofloxacin, C. Myringotomy, D. Coical mastoidectomy
C: Myringotomy
Answer: C: Myringotomy 
Explanation: Indications of myringotomy in acute otitis media:Drum is bulging + acute pain.Incomplete resolution despite antibiotics when drum remains full with persistent conductive deafness.Persistent effusion beyond 12 weeks.