Question
Match the following columns

Column $-I$ Column $-II$
$(A)$ Physical barriers $(1)$ Interferon
$(B)$ Physiological barriers $(2)$ Leukocytes
$(C)$ Cellular barriers $(3)$ Tears
$(D)$ Cytokinin barriers $(4)$ skin

$A$    $B$    $C$    $D$

Answer

d

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