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': 'Commonest causative organism for ASOM in 2 years child is: \nSelect and explain. \nA. Pneumococcus, B. H. influenzae, C. Staphylococcus, D. Streptococcus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common cause of acute otitis media:Streptococcus pneumonia / pneumococcus (35-40% cases)H. influenza (25-30%)M. catarrhalis (10-20%)', 'role': 'assistant'}]