Assertion (A): The 3rd line of defense is highly specific

Reason (R): To become fully functional, it takes several days.

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A is true and R is false

Both are false

Both A and R are true. R is an correct explanation of A

Both A and R are true. R is not an correct explanation of A

answer is B.

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Detailed Solution

The third line of defense is specific, targeted resistance, which is acquired immunity. This immunity is not present at birth but is learned and tailors its attack on specific antigens because it remembers them. An antigen is a substance (living or nonliving) or part of a substance that is recognized as foreign by the immune system and activates an immune response. Instead of being localized to the site of infection, acquired immunity occurs throughout the body and takes longer to develop than innate immunity.

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