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Humans have acquired immune system that produces antibodies to neutralise pathogens. Still innate immune system is present at the time of birth because it

1. provides passive immunity.
2. is very specific and uses different macrophages.
3. produces memory cells for mounting fast secondary response.
4. has natural killer cells which can phagocytose and destroy microbes.

Correct answer: has natural killer cells which can phagocytose and destroy microbes.

Solution

Innate immunity is present at birth because it is the body’s first, non-specific defense system. Among the options, the one referring to natural killer cells best matches this immediate, inborn protection, unlike passive immunity or memory-cell formation, which belong to other immune processes.

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