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': 'The incubation period for polio is \nSelect and explain. \nA. 3 - 7 days, B. 7 - 14 days, C. 2 - 3 weeks, D. 1 - 2 years', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The incubation period of Polio is 7 to 14 days (Range 3-35 days)In 91-96% there is inapparent (subclinical) infectionIn 4-8% Aboive polio or minor illnessIn 1% Non-paralytic polioIn less than 1% paralytic polio occursPark 23e pg: 205', 'role': 'assistant'}]