Which Antibody is Concentrated in the Respiratory Tract

Question

Which antibody is concentrated in the respiratory tract?
A) IgA
B) IgE
C) IgG
D) IgM
E) IgD

Accepted Answer

IgA is the main antibody found in mucous membranes, including the respiratory tract, where it plays a crucial role in immune defense by preventing the entry and colonization of pathogens.