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': 'Human metapneumovirus is structurally similar to: \nSelect and explain. \nA. Influenza virus, B. Respiratory syncytial virus, C. Measles virus, D. Rubella virus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Respiratory syncytial virus', 'role': 'assistant'}]