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': 'Causative organism of SARS \nSelect and explain. \nA. H1N1, B. Corona virus, C. Rotavirus, D. RSV', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]