Which class of antibodies is the FIRST to be produced during the primary immune response?
A. IgA
B. IgD
C. IgE
D. IgG
E. IgM
Answer: E
Which class of antibodies is the FIRST to be produced during the primary immune response?
A. IgA
B. IgD
C. IgE
D. IgG
E. IgM
Answer: E