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
A young female Shagun comes to you in the gynecology OPD and gives the history that she had intercourse with her boyfriend 5 hours back. Select the drug that can act as a single dose postcoital contraceptive for her: 
Select and explain. 
A. Clomiphene citrate, B. Mifepristone, C. Danazol, D. Medroxyprogesterone acetate
B: Mifepristone
Answer: B: Mifepristone 
Explanation: None