# Cornea transplantation has become common due to

$\begin{array}{1 1}(A)\;\text{Easy preservation}\\(B)\;\text{Easy transplantation}\\(C)\;\text{Easy availability}\\(D)\;\text{It does not involve immune system due to absence of blood supply}\end{array}$

It does not involve immune system due to absence of blood supply
Hence (D) is the correct answer.