An organ, such as a kidney, used for transplant needs to be tested for compatibility with the person who is to receive the organ. If this is not done, the
(1) donated organ might attack the body
(2) donated organ might attack the immune system
(3) immune system might attack its own body cells
(4) immune system might attack the donated organ
Answer and explanation
Organ transplants are used widely for those people, whose organs have been damaged and can not function properly, or have failed completely. It is necessary to test the donor organs for compatibility with the person who is receiving the organ because, if immune system doesn't recognize the organ, it might consider it as a foreign object, reject it and attack it. This attack will not allow the organ to be able to function properly which will put the person at risk. Therefore, choice 3 is the correct answer.
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