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: Surgery
Which is not used in carcinoma prostate - 
Select and explain. 
A. Estrogen, B. Progesterone, C. Cyproterone acetate, D. Flutamide
B: Progesterone
Answer: B: Progesterone 
Explanation: None