# Passive immunity is defined as immunity

$\begin{array}{1 1}(A)\;\text{Inherited from parents}\\(B)\;\text{Achieved through vaccination}\\(C)\;\text{Achieved through first exposure to the disease}\\(D)\;\text{Achieved through the sera of other animals enriched in antibodies}\end{array}$

Achieved through the sera of other animals enriched in antibodies
Hence (D) is the correct answer.