Assertion :Histamine is involved in allergic and inflammatory reactions. Reason: Histamine is 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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
When released histamine from mast cells in response to toxic substances or foreign pathogens it causes blood vessels to dilate, increasing blood flow and cell trafficking to the area of infection. It is also involved in the inflammatory response and has a central role as a mediator of itching. As part of an immune response to foreign pathogens.
Hence Histamine is involved in allergic and inflammatory reactions because Histamine is a vasodilator.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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