This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diuretics and Antidiuretics, Subject name: Pharmacology
Drug causing gynecomastia is: 
Select and explain. 
A. Spironolactone, B. Rifampicin, C. Penicillin, D. Bumetanide
A: Spironolactone
Answer: A: Spironolactone 
Explanation: Ans. (A) Spironolactone(Ref: KDT 8/e p635)Important drugs causing gynaecomastia are:D - DigitalisI - IsoniazidS - SpironolactoneC - Cimetidine (and Ketoconazole)O - Oestrogens (and anti-testosterones)