AIIMS 2014 Zoology Immune Response MCQ Question
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 true and Reason is the correct explanation of Assertion
Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion
Assertion is true but Reason is false
Both Assertion and Reason are false
Correct Answer
Detailed Explanation
The correct answer is A because both the assertion and reason are true: a second infection by the same pathogen is quickly eliminated due to the presence of memory B and T-cells. These cells, formed during the initial immune response, enable the body to mount a rapid and robust defense against previously encountered pathogens, effectively explaining why the assertion is correct.
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