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
The progesterone of choice for emergency contraception is aEUR' 
Select and explain. 
A. Norethisterone, B. Medroxyprogesteronacetate, C. Levonorgestrel, D. Desogestrel
C: Levonorgestrel
Answer: C: Levonorgestrel 
Explanation: Levonorgestrel [Ref: Dutra Obstetrics 6/e, p 549-550; S.K. Chaudhuri Feility Control 6/e, p 190-199; Novak's Gynaecology I4/e, p 283-385. Repeat from Nov 09 Q no.154