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': 'Site of action of polio virus is \nSelect and explain. \nA. Medullary cone, B. Posterior roots, C. Anterior horn of spinal cord, D. Posterior horn of spinal cord', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Polio virus acts at motor nerve ending i.e anterior horn cells of spinal cord leads to flaccid paralysis.', 'role': 'assistant'}]