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The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone:
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- calcitonin
- prolactin
- adrenaline
- melatonin
Correct Option: D
Melatonin is a hormone that regulates the 24 hour rhythm of our body such as the sleep-wake cycle etc. Melatonin is produced by pineal gland in the brain, which is responsible for operation and regulation of the biological clock in mammals.
