# Obstacle to large scale transplantation of organs is

$\begin{array}{1 1}(A)\;\text{Insufficiency of organ donors}\\(B)\;\text{Immunological rejection of foreign bodies}\\(C)\;\text{Religious or ethnic considerations}\\(D)\;\text{Lack of effective surgical techniques}\end{array}$

Obstacle to large scale transplantation of organs is immunological rejection of foreign bodies
Hence (B) is the correct answer.