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: Social & Preventive Medicine
[{'content': 'Which of the following lead to an outbreak of Influenza in China in 2013? \nSelect and explain. \nA. H7N9, B. H3N2, C. H1N1, D. H2N2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]