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
Spironolactone is most useful in _________ syndrome: 
Select and explain. 
A. Zollinger-Ellison, B. Conn's syndrome, C. Cushing syndrome, D. Acromegaly
B: Conn's syndrome
Answer: B: Conn's syndrome 
Explanation: None