Read this selection: Addison disease is caused mostly by idiopathic atrophy of the adrenal cortex. Which of the following statements best describes the cause of Addison disease?
A. The adrenal cortex shrinks due to exogenous administration of corticosteroids.
B. The adrenal cortex shrinks for unknown reasons.
C. The adrenal cortex is enlarged due to increased hormone production.
D. The adrenal cortex becomes diseased through viral infection and shrinks
E. The adrenal cortex stops functioning due to a bacterial infection.
Answer: B
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