Which of the following is correctly matched?

A) IgA - found in saliva and tears
B) IgD - can cross the placenta
C) IgG - first to challenge the antigen
D) IgM - antigen-binding receptor on B cells
E) IgE - transfusion reactions

IgA

An antibody essential to the immune function of mucosal surfaces.

Saliva and Tears

Bodily fluids produced by salivary and lacrimal glands, respectively, playing roles in digestion, oral health, and eye lubrication.

IgD

A class of antibodies that plays a role in the activation of immune cells and is found in small amounts in the blood.