This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Myxo Viruses, Subject name: Microbiology
Most common cause of bronchiolitis in children? 
Select and explain. 
A. RSV, B. Papova virus, C. Adenovirus, D. H3N1
A: RSV
Answer: A: RSV 
Explanation: Ans. (a) RSV