This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': "Hypokalemia.may be a feature of all following diseases, except - \nSelect and explain. \nA. Addison's disease, B. Cushing's syndrome, C. Baer's syndrome, D. Guelman's syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: serum sodium, chloride, and bicarbonate level are decreased and serum potassium is elevated. Hyperkalemia due to aldosterone deficiency, impaired glomerular filtration, and acidosis( Harrison 17 pg 2264)', 'role': 'assistant'}]