Melatonin is secreted by the:
A) thyroid gland.
B) parathyroid gland.
C) pancreas.
D) pineal gland.
D
Explanation: A) The thyroid gland secretes thyroxine, triiodothyronine, and calcitonin.
B) The parathyroid gland secretes parathyroid hormone.
C) The pancreas secretes glucagon, insulin, and somatostatin.
D) Correct. Melatonin is secreted by the pineal gland.
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