This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Emergency Contraception - Ulipristal acetate (UPA), Subject name: Gynaecology & Obstetrics
Emergency contraceptive contains? 
Select and explain. 
A. Estradiol, B. Levonorgestrel, C. Estrone, D. PGE.
B: Levonorgestrel
Answer: B: Levonorgestrel 
Explanation: ANSWER: (B) LevonorgestrelREF: Shaw 13th ed p. 233"The post coital pill or emergency pill or morning after pill contains levonorgesterol (LNG)"