A Patient with an Autoimmune Disorder Says,"I Don't Know Why

A patient with an autoimmune disorder says,"I don't know why this happened to me.I try to exercise and eat well." How should the nurse respond?

A) "These disorders are usually associated with a vitamin deficiency."
B) "These problems happen when your body misinterprets normal cells as being foreign and attempts to destroy them."
C) "It happened because you were exposed to something repeatedly,and then the body decided it needed to destroy it."
D) "Chronic illnesses are the cause of autoimmune disorders."