This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
Drug useful in breast cancer is 
Select and explain. 
A. Tamoxifen, B. Cyprotenene, C. Testosterone, D. Chlorambucil
A: Tamoxifen
Answer: A: Tamoxifen 
Explanation: Medications Estrogen modulator, Chemotherapy, Hormone based chemotherapy, and Bone health