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Towards academic reading

Read this paragraph and answer the question below.

Organ Transplants

 

An organ transplant is a special type of surgery in which a healthy organ (such as a kidney or a heart) from a donor's body is used to replace an organ that does not function well. Unfortunately, sometimes the body rejects the new organ because the immune system sees it as a 'foreign’ element - as something that does not belong to the body.

In this case the immune system will try to destroy the new organ.

Which answers below best complete this sentence? Choose 1 correct answer. According to the text, the body may reject an organ if..

the immune system of the person receiving the organ does not recognize or accept it.

both the donor and person who receives the organ are healthy.