What is graft-versus-host disease?
A) Immune system cells in transplanted bone marrow attack the body of its new host.
B) Immune system cells of the host attack the newly transplanted bone marrow and reject it.
C) It occurs when tissue from an isograft is rejected.
D) It occurs when tissue from a xenograft is rejected.
E) It occurs when tissue from an allograft is rejected.
Answer: A
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