Which is the First Antibody Class Made During the Primary

Question

Which is the first antibody class made during the primary response to an antigen?
A)IgA
B)IgM
C)IgG
D)IgE

Accepted Answer

During the primary response to an antigen, the first antibody class made is IgM. IgM is a pentameric antibody that is produced by B cells in response to initial exposure to an antigen.