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5 / 11  ________ is a hormone secreted by the pineal gland that plays a role in regulating biological rhythms and immune function.
A  growth hormone
B  melatonin
C  LH
D  FSH

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Source:  OpenStax, Psychology. OpenStax CNX. Feb 03, 2015 Download for free at https://legacy.cnx.org/content/col11629/1.5
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