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
All except one is recommended for use in emergency contraception 
Select and explain. 
A. Combined oral contraceptives, B. Progestin only regimens, C. Selective oestrogen receptor modulators, D. Antiprogestins
C: Selective oestrogen receptor modulators
Answer: C: Selective oestrogen receptor modulators 
Explanation: Selective progestin receptor modulators are used as emergency contraceptive.