One Surprising Aspect of the Immune System Is That Individuals

Multiple Choice

One surprising aspect of the immune system is that individuals make responses to human tissues from a different individual, causing serious problems for organ and tissue transplantation. The basis for this immune response is:

A) The extensive polymorphism of MHC genes in the human population
B) The fact that transplanted tissues often carry infectious microbes into the recipient
C) The fact that individuals may differ in their blood group antigens (i.e., their blood type)
D) The presence of many antigen-presenting-cells in the transplanted tissue
E) The presence of many B and T lymphocytes in the transplanted tissue