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(C) The innate immune system is present from birth and provides non-specific defense against pathogens.It acts as the first line of defense through va

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has natural killer cells which can phagocytose and destroy microbes.

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(C) The innate immune system is present from birth and provides non-specific defense against pathogens.It acts as the first line of defense through various barriers such as physical,physiological,cellular,and cytokine barriers.Natural killer $(NK)$ cells are a type of lymphocyte that belongs to the innate immune system.These cells are capable of recognizing and destroying infected or abnormal cells through phagocytosis and the release of cytotoxic granules,thereby providing immediate protection before the acquired immune system is activated.

List-$I$	List-$II$
$(a)$ $IgG$	$(i)$ Protection of body surfaces
$(b)$ $IgA$	$(ii)$ Regulation of allergic reactions
$(c)$ $IgM$	$(iii)$ Activates $B$-cells
$(d)$ $IgD$	$(iv)$ Protection of body fluids
$(e)$ $IgE$	$(v)$ Protection of blood circulation

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

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The toxic substances produced by foreign bodies that trigger an immune response are known as:

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Which of the following provides passive immunity?
$i$. Colostrum
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$iii$. After recovery from measles
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