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
All of the following are features of primary hyperaldosteronism except - 
Select and explain. 
A. Pedal edema, B. Polyurea, C. Hypokalemia, D. Hypertension
A: Pedal edema
Answer: A: Pedal edema 
Explanation: Patients with primary hyperaldosteronism characteristically do not have edema unless they are associated with congestive heart disease, renal disease or preexisting abnormalities.
The patients do not have edema, since they exhibit an "escape phenomenon" from the sodium retaining aspects of mineralocorticoid.