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Question

Assertion :Melatonin influences the menstrual cycle, pigmentation and defense capability. Reason: Melatonin plays an important role in the regulation of diurnal rhythm of our body.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Melatonin (secreted by pineal gland) concentration in the blood appears to follow 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 response, the pineal gland may act as a kind of 'biological clock' which may produce circadian rhythms(variations following a 24 hour cycle). In addition, melatonin also influences metabolism, pigmentation, the menstrual cycle as well as our defence capability.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

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