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': 'Most common type of polio is ? \nSelect and explain. \nA. Non-paralytic polio, B. Paralytic polio, C. Aboive illness, D. Inapparent infection', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is `d' i.e., Inapparent infection", 'role': 'assistant'}]