Which of these hormones may have a primary role in many circadian rhythms?

Insulin

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Estradiol

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Melatonin

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Epinephrine

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Solution

The correct option is D Melatonin
The circadian rhythm or 24 hours diurnal rhythm of our body is maintained by Melatonin hormone secreted from the Pineal gland which is located on the dorsal side of forebrain. In addition, the melatonin hormone even assist in metabolism, pigmentation and even maintaining our defence capabilities.
So, the correct answer is 'Melatonin'.

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