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3 / 11  Allergy to pollen is classified as ________.
A  an autoimmune reaction
B  immunodeficiency
C  delayed hypersensitivity
D  immediate hypersensitivity

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Source:  OpenStax, Concepts of biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11487/1.9
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