The 'second line of defence' is known as

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(B) The human body has three lines of defence against pathogens.$1$. The 'first line of defence' consists of physical and physiological barriers like

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$WBC$

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(B) The human body has three lines of defence against pathogens.$1$. The 'first line of defence' consists of physical and physiological barriers like skin,mucus,and secretions.$2$. The 'second line of defence' is the innate immune response,which includes cellular barriers like $WBC$ (specifically phagocytes like macrophages and neutrophils),inflammatory responses,and fever.$3$. The 'third line of defence' is the adaptive or acquired immune response,which involves $B$-lymphocytes and $T$-lymphocytes (antibodies).Therefore,$WBC$ are the components that constitute the second line of defence.

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