This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Poal of entry of poliovirus in mainly - 
Select and explain. 
A. Gastrointestinal tract, B. Nasal mucosa, C. Lung, D. Skin
A: Gastrointestinal tract
Answer: A: Gastrointestinal tract 
Explanation: Polio virus is transmitted by feco oral route through ingestion.multiply i the alimentaty canal <\p> REF:MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.486