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
Drug not causing gynaecomastia is ? 
Select and explain. 
A. Cimetidine, B. Spironolactone, C. Pyrazinamide, D. Ketoconazole
C: Pyrazinamide
Answer: C: Pyrazinamide 
Explanation: Ans. is 'c' i.e., Pyrazinamide