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': 'At present following types of influenza viruses are circulating in the world, except ? \nSelect and explain. \nA. HIM, B. H3N2, C. H5N,, D. B virus', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., H5N, At present three types of influenza viruses are circulating in the world: A(H/N1), A (H3N2) and B viruses. WHO global surveillance activities have identified human infection with a new influenza virus called A ) in Hong Kong in mid1997. However, the possibility that the outbreak heralded a global influenza pandemic did not materialize.", 'role': 'assistant'}]