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: Microbiology
[{'content': 'All are false regarding polio virus except: \nSelect and explain. \nA. Most cases are symptomatic, B. Inactivated vaccine given IM, C. Inactivated polio vaccines are given to child less than 3 years of age, D. Only one type exists', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Inactivated vaccine is given IM Inactivated poliovaccine or IPV (salk type) is given subcutaneously or IM. Other options Option L. Most cases of polio are asymptomatic Option c Dose schedule of IPV: First dose when infant is 6 weeks old Additional doses are recommended prior to school entry and then every five years until the age of 18. Option d These are three serotypes of polio virus Most outbreaks of paralytic polio are due to type 1.', 'role': 'assistant'}]