A staff nurse is teaching a client who has Addison's disease about the disease process. The client asks the nurse what causes Addison's disease. Which of the following responses should the nurse make?

A. Addison’s disease is caused by the underproduction of hormones (including aldosterone and cortisol) by the adrenal glands, leading to symptoms like fatigue, hypotension, and electrolyte imbalances. B. Overproduction of growth hormone by the pituitary gland causes acromegaly or gigantism, not Addison’s disease. C. Lack of insulin production by the pancreas causes type 1 diabetes mellitus, not Addison’s disease. D. Overproduction of parathormone (PTH) by the parathyroid glands leads to hyperparathyroidism, not Addison’s disease.