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
[{'content': 'Gynaecomastia is caused by : \nSelect and explain. \nA. Spironolactone, B. Rifampicin, C. Thiazide, D. Propranolol', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' spironolactone Drugs causing gynecomastiaCalcium channel antagonist*Clomiphene*Digitalis*EstrogensEthionamide*Griseofulvin*Isoniazid*Phenytoin*Methyldopa*Spironolactone*TestosteroneKetoconazole*Reserpine*", 'role': 'assistant'}]