What Class of Antibodies is Normally Found in the Mucosa

Question

What class of antibodies is normally found in the mucosa of the respiratory tract?
A) IgA
B) IgD
C) IgE
D) IgG
E) IgM

Accepted Answer

IgA is the main class of antibodies found in mucosal areas such as the respiratory tract, protecting against pathogens that enter through mucous membranes.