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': 'Most common mode of transmission of polio virus? \nSelect and explain. \nA. Droplet infection, B. Fecal-oral route, C. Blood transfusion, D. Veical transmission', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Fecal-oral route . Polio transmission is mostly restricted to developing countries where fecal-oral route is the most common mode of transmission.", 'role': 'assistant'}]