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: Social & Preventive Medicine
All are used as emergency contraception except 
Select and explain. 
A. Saheli, B. Combined OCPS, C. IUD, D. High dose estrogen for 5 days
A: Saheli
Answer: A: Saheli 
Explanation: None