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
All drugs are used in treatment of breast carcinoma except : 
Select and explain. 
A. Tamoxifen, B. Flutamide, C. Cyclophosphamide, D. Letrozole
B: Flutamide
Answer: B: Flutamide 
Explanation: None