This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, 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: RSV can lead to tracheobronchitis,bronchiolitis and pneumonia. REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:510,511", 'role': 'assistant'}]