Question

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 1

I would go for (4) because I know that it would reject it therefore it would attack the organ since it's a foreign object to the body.