Assertion- OKT-3 is used to prevent graft rejection following kidney transplantation
Reason- OKT-3 blocks immune cells which attack foreign grafts.
(a) Both Assertion and Reason are true, and the reason is the correct explanation of the assertion
(b) Both Assertion and Reason are true, but the reason is not the correct explanation of the assertion
(c) Assertion is true but Reason is false
(d) Both Assertion and Reason are false