This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Pediatrics
[{'content': 'Organism in bronchiolitis is: \nSelect and explain. \nA. Adeno virus, B. Influenza virus, C. Rhino virus, D. RSV', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: dRef: Pedia ghai, 6th ed, p.352', 'role': 'assistant'}]