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: Pediatrics
[{'content': 'True about polio - \nSelect and explain. \nA. Paralytic polio is most common, B. Spastic paralysis, C. IM injections and increased muscular activity lead to increased paralysis, D. Polio drop given only in < 3 year', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]