Assertion :Second infection of the same pathogen is quickly eliminated. Reason: Preformed memory B and T-cells elicit a quick and vigorous attack on pathogens.

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
In the cell type mediated immunity, lymphocytes are responsible for inducing the immune response.
Lymphocytes have the unique antigen receptor on their surface. When a person gets infected the second time with the same pathogen, the memory cells.
When the cell comes in contact with the antigen, it undergoes proliferation and produces a number of daughter cells.
Some of these cells play an important role in eliminating the disease-producing agents while others become memory cells.
These memory cells are very important role if a person got exposed to the same pathogen second time. They recognize the pathogens and eliminate them.
So, the correct option is A.

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