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': 'All of the following are true regarding acute attack of Polio, except - \nSelect and explain. \nA. Fecal sample is carried in cold box, B. Three consecutive stool samples are positive, C. Investigation done in 48 hours, D. Throat swab is taken for diagnosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]