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': "The respiratory' syncytial virus \nSelect and explain. \nA. The respiratory' syncytial virus, B. The para influenza virus, C. The adenovirus, D. The coronavirus", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Croup tLarvngotracheobronchitis\no Croup is a viral infection of upper respiratory tract,\no Children between the age of 1-5 years are affected,\no Para-influenza type I virus is the most common causative organism.\no Other viruses implicated in causaction are RSV, influenza virus, Adneovirus and Rhinovirus.', 'role': 'assistant'}]