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
Hypokalemia.may be a feature of all following diseases, except - 
Select and explain. 
A. Addison's disease, B. Cushing's syndrome, C. Baer's syndrome, D. Guelman's syndrome
A: Addison's disease
Answer: A: Addison's disease 
Explanation: 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)