This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Incubation period of Measles \nSelect and explain. \nA. 14 days, B. 1 month, C. 3 month, D. 5 month', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Measles is an acute infectious disease caused by myxovirus with an incubation period commonly between 10 days from exposure to onset of fever and 14 days to onset of rash Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition', 'role': 'assistant'}]