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
Which of the following drug is used in the treatment of estrogen dependent breast carcinoma ? 
Select and explain. 
A. Tamoxifen, B. Methotrexate, C. Paclitaxel, D. Adriamycin
A: Tamoxifen
Answer: A: Tamoxifen 
Explanation: None