Assertion :Histamine is related with allergic and inflammatory reactions. Reason: Histamine is a vasodilator.

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 compound which is released by basophils of blood and mast cells of connective tissue during injury. Chemicals from microbes and histamines together cause dilation of capillaries surrounding the injury and increase the permeability of the capillary wall. As a result, more blood flows to that area, making it red and warm, and fluid leaks out into the tissue spaces, causing its swelling.
Histamine causes allergic effects but it is not due to its vasodilatory action.
Thus, Assertion and Reason both are correct but Reason is not the correct explanation of Assertion. Hence correction answer is option B.

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