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. Flutamide, B. Cimetidine, C. Pyrazinamide, D. Methotrexate
B: Cimetidine
Answer: B: Cimetidine 
Explanation: Ans. (b) CimetidineRef Appendix-39 for 'Drugs causinggynaecomastia"