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
Most common mode of ttransmission of polio virus- 
Select and explain. 
A. Droplet infection, B. Fecal-oral route, C. Blood transfusion, D. Vertical transmission
B: Fecal-oral route
Answer: B: Fecal-oral route 
Explanation: None