During a bone marrow transplant, if the recipient's immune system recognizes ABO blood group antigens on the donor's red blood cells as foreign, which consequence follows?

💡 Explanation

An acute hemolytic transfusion reaction occurs because pre-existing antibodies in the recipient's plasma bind to the donor's red blood cell antigens, activating the complement system and causing intravascular hemolysis; therefore, a hemolytic reaction occurs, rather than erythropoiesis stimulation, B lymphocyte deletion, or effective stem cell differentiation.

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