A. Respiratory
A.
B. Nervous
B.
C. Digestive
C.
D. Circulatory
D.
Correct Answer: B
সঠিক উত্তর: B
Explanation
ব্যাখ্যা
Polio is a viral disease that primarily attacks the nervous system, specifically the spinal cord and brain. This can lead to paralysis of muscles, including those responsible for breathing. While the virus can enter the body through the digestive system, its main impact is on the nervous system.