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
[{'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' i.e., Spironolactone Drugs causing gynecomastia Calcium channel antagonist o Isoniazide o Reserpine o Clomiphene o Ketoconazole Digitalis o Methyldopa o Estrogens o Phenytoin o Cimetidine Ethionamide o Testosterone o Griseofulvin o Spironolactone", 'role': 'assistant'}]