This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
[{'content': 'Gynaecomastia is a side effect of all, EXCEPT : \nSelect and explain. \nA. Digitalis, B. Ketoconazole, C. Rifampicin, D. Spironolactone', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' Rifampicin Drugs causing GynecomastiaKetoconazole*Calcium channel blockers*Digitalis*Estrogens*Ethionamide*Griseofuloin*INHMethyldopa*Phenytoin*Reserpine*Spironolactone*Testosterone*", 'role': 'assistant'}]