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Assertion (A): Melatonin is called "sleep hormone".

Reason (R): Melatonin produces circadian rhythms.

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Correct option is (a)

Explanation of 'A' & 'R' :- Melatonin is called "sleep hormone", because it promotes sleep. Its secretion increases in dim light an decreases in bright light. Melatonin concentration in the blood appears to flow a diurnal (day-night) cycle as it rises in the evening and through the night and drops to a low around noon. Because of this light mediated responses, it is believed to produce circadian rhythms (variation following a 24 hours cycle).

Result: Hence, it is proved that both 'A' and 'R' are true and as 'R' is the correct explanation of 'A', so the answer is option (a).

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