The sneezing, runny nose, and itchy eyes associated with allergies are caused when
A. smooth muscles reduce the size of air passageways in the lungs.

B. the immune system attacks the bodyâ€™s own cells.

C. mast cells release histamines.

D. infected cells produce interferon.

Question

The sneezing, runny nose, and itchy eyes associated with allergies are caused when 
 A. smooth muscles reduce the size of air passageways in the lungs.  
 
 B. the immune system attacks the bodyâ€™s own cells.  
 
 C. mast cells release histamines.  
 
 D. infected cells produce interferon.

anonymous · Answer

C. mast cells release histamines.