This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'which strain of influenza was declared recently as pandemic \nSelect and explain. \nA. H1N1, B. H5N1, C. H7N7, D. H3N3', 'role': 'user'}, {'content': 'Answer: A \nExplanation: inJune 2009 a new strain of H1N1 influenza called swine flu was declared to be a global pandemic by the WHO REF : ANANTHNARYANA', 'role': 'assistant'}]