This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'All of the following statements are true regarding poliovirus except - \nSelect and explain. \nA. It is transmitted by feco-oral route, B. Asymptomatic infections are common in children, C. There is a single serotype causing infection, D. Live attenuated vaccine produces herd immunity', 'role': 'user'}, {'content': "Answer: C \nExplanation: Poliovirus strains are classified into 3 types-1,2 and 3. TYPE 1 most common. REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:486", 'role': 'assistant'}]