Answer:
A heart transplant is a surgery in which doctors remove a person's sick heart and replace it with a healthy donor heart. ... They choose to donate the organs because they want to help someone else who is sick.
Here's another example:
Mayo Clinic is the largest integrated transplant provider in the United States. Mayo Clinic has pre-eminent adult and pediatric transplant programs, offering heart, liver, kidney, pancreas, lung, hand, face, and blood and bone marrow transplant services.
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