Rejection of a transplanted organ is made less likely by

A. True  T lymphocytes are responsible for tissue rejection.

B. False  This environment may be necessary because of suppression of the recipient’s immune responses; it has no bearing on the rejection process.

C. False  This would not affect the transplant antigens.

D. True  These suppress the multiplication of lymphocytic stem cells.

E. True  Identical twins have identical antigens and do not reject each other’s tissues