This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aboions, Spontaneous & Induced Emergency Contraception (Hey,whats the hurry !), Subject name: Gynaecology & Obstetrics
Antiprogesterone compound RU-486 is effective for inducing aboion if the duration of pregnancy is: 
Select and explain. 
A. 63 days, B. 72 days, C. 88 days, D. 120 days
A: 63 days
Answer: A: 63 days 
Explanation: Mifepristone (RU 486) an Antiprogestin, degenerates the pregnancy in doses ranging from 200-600mg. This is followed by Misoprostol (prostagladin) in 400ug orally or 800ug vaginally which causes uterine contractions to expel the dead fetus. This regime is -99% successful - If done within 1st 7 weeks -95% successful - If done within 1st 9 weeks