Which statement is true concerning IgM?
a. IgM is the first antibody produced during the initial response to an antigen.
b. IgM mediates many common allergic responses.
c. IgM is the most abundant class of immunoglobulins.
d. IgM is capable of crossing the human placenta
Answer: a. IgM is the first antibody produced during the initial response to an antigen.
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