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': 'Swine flu is ca used by ? \nSelect and explain. \nA. H1N1, B. H5N1, C. H3N1, D. H3N3', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Swine infkuenza, a new H1N1 Virus causes swin flue<\\p> REF:ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.503', 'role': 'assistant'}]