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(D) Allergies are an exaggerated immune response to certain antigens present in the environment. $1$. In organ transplantation,the body's immune syste

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Both $A$ and $B$

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(D) Allergies are an exaggerated immune response to certain antigens present in the environment. $1$. In organ transplantation,the body's immune system recognizes the transplanted organ as foreign and mounts an immune response,which is a form of hypersensitivity similar to allergic reactions. $2$. In autoimmunity,the body loses the ability to differentiate between self and non-self cells,leading to an immune attack on its own tissues,which also involves hypersensitivity mechanisms. Therefore,allergic reactions (hypersensitivity) play a significant role in both organ transplantation rejection and autoimmune diseases.

In which of the following characteristics of the body does the allergic reaction play an important role?

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