What occurs when someone receives a tissue transplant from an unrelated individual?
A. The host's lymphocytes enter the tissues and become suppressed.
B. The host's lymphocytes enter the tissues and become activated.
C. The host's lymphocytes that react to the tissue graft are deleted in the thymus.
D. The donor's lymphocytes suppress the host's lymphocytes, allowing for graft survival.
E. The donor's lymphocytes destroy the host's immune system.
B
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