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': 'Which is not a component of  Influenza trivalent vaccine \nSelect and explain. \nA. H1N1 virus, B. Influenza B virus, C. H3N2 virus, D. H5N1 virus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: It is a trivalent vaccine consisting\xa0\na. H1N1\nb. H3N2\xa0\nc.\xa0Influenza B virus', 'role': 'assistant'}]