This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraceptives, Subject name: Gynaecology & Obstetrics
Contraceptive LNG-IUD (levonorgestrel intra-uterine device) has the cumulative pregnancy rate at 5 years of: 
Select and explain. 
A. 0.5, B. 1, C. 1.5, D. 2
A: 0.5
Answer: A: 0.5 
Explanation: Ans. is a, i.e. 0.5Ref: Leon Speroff 7th/ed, p981LNG - IUD has a pregnancy rate of 0.2 100 women years (HWY) (here nearest is 0.5 so that is the answer).