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': 'Incubation period less than 10 days seen - \nSelect and explain. \nA. Influenza, B. Cholera, C. Plague, D. Chickenpox', 'role': 'user'}, {'content': 'Answer: A \nExplanation: icubation period of influenza virus is 1-3days REF:ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.500', 'role': 'assistant'}]