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 acute tonsillitis is which of the following? \nSelect and explain. \nA. B streptococci, B. Parainfluenza virus, C. H influenza, D. Corynebacterium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Parainfluenza virus causes tracheobronchitis and H influenza cause acute epiglottitis.', 'role': 'assistant'}]