Sometimes Eli has difficulty falling asleep. His parents make sure he goes to bed at around the same time each night, but two or three nights a week he'll come out after an hour and report that he just can't sleep. Eli's parents consult with his pediatrician, and are advised to give him a supplement of ________ on the nights when he has trouble sleeping.
A. norepinephrine
B. androstenedione
C. melatonin
D. oxytocin
Answer: C
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