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
Anti progesterone drug is : 
Select and explain. 
A. Cyproterone, B. Mifepristone, C. Spironolactone, D. Tamoxifen
B: Mifepristone
Answer: B: Mifepristone 
Explanation: Mifepristone