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 which drug - 
Select and explain. 
A. Spironolactone, B. Rifampicin, C. Thiazide, D. Propanolol
A: Spironolactone
Answer: A: Spironolactone 
Explanation: Ans. is 'a' i.e., Spironolactone Drugs causing gynecomastiao Calcium channel antagonisto Isoniazideo Reserpineo Clomipheneo Ketoconazoleo Digitaliso Methyldopao Estrogenso Phenytoino Cimetidineo Ethionamideo Testosteroneo Griseofulvino Spironolactone