What is the process of recognizing the difference between those structures that are part of the body (self) and those that are not (nonself), and then removing or neutralizing the nonself items?

The immune system distinguishes the body’s own structures (“self”) from foreign substances (“nonself”), then attacks or neutralizes the foreign substances. This process is called the immune response, so choice B is correct. Immunodeficiency is reduced immune function, while an autoimmune disease occurs when the immune system mistakenly attacks the body’s own tissues.

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