This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine, Subject name: Pharmacology
A young female Shagun comes to you in the gynaecology 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: * Single dose of mifepristone taken within 72 hours of unprotected intercourse is an effective method to prevent pregnancy. * Two tablets of OCP within 72 hours of unprotected intercourse followed by 2 tablets after 12 hours can also be used as a post-coital contraceptive method. * Two tablets of levonorgestrel (0*75 mg each) taken 12 hours apa can also be used for emergency contraception.