Which of the Following Antibodies is a Pentamer

Question

Which of the following antibodies is a pentamer?
A)IgA
B)IgD
C)IgM
D)IgE

Accepted Answer

IgM is a pentamer, meaning it consists of five monomer subunits joined together by disulfide bonds. In contrast, IgA, IgD, and IgE are monomers or dimers.