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
Mifepristone is a: 
Select and explain. 
A. Progesterone antagonist, B. Oestrogen antagonist, C. Both, D. None
A: Progesterone antagonist
Answer: A: Progesterone antagonist 
Explanation: None