This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, 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. Barter's syndrome, D. Gitelman's syndrome
A: Addison's disease
Answer: A: Addison's disease 
Explanation: None