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: Microbiology
[{'content': 'Most common cause of viral pneumonia in infant is ? \nSelect and explain. \nA. Rhinovirus, B. RSV, C. Reovirus, D. CMV', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., RSV RSV is the most common cause of pneumonia and bronchilis in infants. In adults, influenza is the most common cause of viral pneumonia.", 'role': 'assistant'}]