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: Gynaecology & Obstetrics
Which is not used in the treatment of endometriosis : 
Select and explain. 
A. Danazol, B. Tamoxifen, C. Medroxyprogesterone, D. GnRH analogues
B: Tamoxifen
Answer: B: Tamoxifen 
Explanation: Tamoxifen