Assertion :Histamine is a potent vasodilator. Reason: Histamine is responsible for the nasal congestion associated with common cold and allergic response to pollen.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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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
Histamine is a potent vasodilator. It has various functions.

It contracts the smooth muscles in the bronchi and gut and relaxes other muscles,such as those in the walls of fine blood vessels.

Histamine is also responsible for the nasal congestion associated with common cold and allergic response to pollen.

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Option B is correct.

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