<prompt> A 40-year-old man complains of nausea, vomiting, diarrhea, and cramping abdominal pain. His temperature is 38degC , blood pressure 9060 mm Hg, and pulse rate 90minute. On physical examination, the patient appears dehydrated, with sunken eyeballs, dry tongue, and poor skin turgor. Hyperpigmentation is noted in the palmar creases and the gingival margins. Laboratory results include fasting serum glucose of 62 mgdL, BUN of 27 mgdL, Na of 122 mEqL, and K of 6.5 mEqL. Which of the following is the most likely cause of this patients symptoms?AmyloidosisAutoimmunityMetastatic cancerSarcoidosis  <response>: - Given clinical features suggests the diagnosis of Primary chronic adrenal insufficiency Addison disease. - MCC of addison disease in developed countries - Autoimmunity - MCC of addison disease in developing countries like India - Tuberculosis - It is fatal wasting disorder caused by failure of adrenal glands to produce glucocoicoids, mineralocoicoids androgens. - If untreated, Addison disease is characterized by weakness, weight loss, gastrointestinal symptoms, hypotension, electrolyte disturbances hyperpigmentation. 