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5 / 13  The first antibody class to appear in the serum in response to a newly encountered pathogen is ________.
A  IgM
B  IgA
C  IgG
D  IgE

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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