Which Statement Is True Concerning IgM

question 21

Multiple Choice

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.

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