A) calcitonin
B) prolactin
C) adrenaline
D) melatonin
Correct Answer: D
Solution :
Melatonin, also known as chemically N-acetyl 5-methoxytryptamine is a naturally occurring compound found in animals, plants and microbes. In animals, circulating levels of the hormone melatonin vary in a daily cycle, thereby allowing the entraiment of the circadian rythrns of several biological functions.
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