This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adverse Drug Effect, Subject name: Pharmacology
Gynaecomastia is caused by : 
Select and explain. 
A. Spironolactone, B. Rifampicin, C. Thiazide, D. Propranolol
A: Spironolactone
Answer: A: Spironolactone 
Explanation: Ans. is 'a' spironolactone Drugs causing gynecomastiaCalcium channel antagonist*Clomiphene*Digitalis*EstrogensEthionamide*Griseofulvin*Isoniazid*Phenytoin*Methyldopa*Spironolactone*TestosteroneKetoconazole*Reserpine*