Diseased organs can sometimes be replaced by healthy organs from donors. A long-standing problem with organ transplants is rejection of the organ by the recipient. Rejection would not be expected if the transplanted organ came from a(n):

Question

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Identical (monozygotic) twins have the same genetic makeup, which includes the human leukocyte antigens (HLA) that are responsible for initiating immune responses. Therefore, their immune systems should not recognize the transplanted organ as foreign and reject it. The other choices may have some similarities but could still differ in their HLA types, leading to a higher risk of rejection.

Diseased Organs Can Sometimes Be Replaced by Healthy Organs from Donors