This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Pharmacology), Subject name: Pharmacology
Which one of the following is an Aldosterone antagonist? 
Select and explain. 
A. Spironolactone, B. Amiloride, C. Triameterine, D. Acetazolamide
A: Spironolactone
Answer: A: Spironolactone 
Explanation: (A) Spironolactone > Spironolactone is a steroid chemically related to the mineralocorticoid aldosterone> Spironolactone is an aldosterone antagonist.