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: Pharmacology
Canrenone is a metabolite of : 
Select and explain. 
A. Ampicillin, B. Spironolactone, C. Furosemide, D. Acetazolamide
B: Spironolactone
Answer: B: Spironolactone 
Explanation: None