<prompt> Commonest cause of acute Otitis media in children is:H. influenzaeStreptococcus pneumoniaeStaph. aureusPseudomonas  <response>: b Streptococcus pneumoniaeRef. Scott Brown, 8th ed., Vol 2; 139Irrespective 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. 