This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Middle Ear (Otitis Media), Subject name: ENT
Commonest cause of acute Otitis media in children is: 
Select and explain. 
A. H. influenzae, B. Streptococcus pneumoniae, C. Staph. aureus, D. Pseudomonas
B: Streptococcus pneumoniae
Answer: B: Streptococcus pneumoniae 
Explanation: (b) Streptococcus pneumoniae(Ref. Scott Brown, 8th ed., Vol 2; 139)Irrespective of the age of the patient suffering from AOM, the MC organism is Streptococcus pneumoniae followed by Haemophilus influenzae.In the ear Pseudomonas causes perichondritis, diffuse Otitis externa and malignant Otitis externa and it is also the main organism in unsafe CSOM.