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 Nipah virus \nSelect and explain. \nA. 4 -14 days, B. 2 - 6 days, C. 3 -8 days, D. 5 - 10 days', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ref:Park's Textbook of Preventive and Social Medicine 25th Ed Pg.310", 'role': 'assistant'}]