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
[{'content': 'All of the following are features of primary hyperaldosteronism except - \nSelect and explain. \nA. Pedal edema, B. Polyurea, C. Hypokalemia, D. Hypertension', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Patients with primary hyperaldosteronism characteristically do not have edema unless they are associated with congestive heart disease, renal disease or preexisting abnormalities.\nThe patients do not have edema, since they exhibit an "escape phenomenon" from the sodium retaining aspects of mineralocorticoid.', 'role': 'assistant'}]