<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 48-year-old woman presents to her primary care physician with complaints of persistent fatigue, dizziness, and weight loss for the past 3 months. She has a history of hypothyroidism and takes thyroxine replacement. Her blood pressure is 9060 mm Hg in a supine position and 6540 mm Hg while sitting, temperature is 36.8C 98.2F, and pulse is 75min. On physical examination, there is a mild increase in thyroid size, with a rubbery consistency. Her skin shows diffuse hyperpigmentation, more pronounced in the oral mucosa and palmar creases. Which of the following best represent the etiology of this patients condition?? A: Autoimmune destruction of the adrenal gland, B: adrenocorticotropic hormone secretion from the pituitary gland, C: corticotropin-releasing hormone secretion from the hypothalamus, D: Prolonged corticosteroid therapy, E: iron absorption and deposition in the body,  <response>: This is a clinical case scenario describing a 48-year-old woman with fatigue, dizziness, weight loss, low blood pressure, mild thyroid enlargement, and hyperpigmentation. The key findings pointing to the diagnosis are orthostatic hypotension, hyperpigmentation of skin and mucosa, and rubbery thyroid enlargement. These suggest adrenal insufficiency likely due to autoimmune adrenalitis. Prolonged corticosteroid therapy can also cause adrenal insufficiency but there is no mention of steroid use in the history. The other options can be ruled out based on the clinical presentation.A: Autoimmune destruction of the adrenal gland 