<prompt> Contraceptive LNG-IUD levonorgestrel intra-uterine device has the cumulative pregnancy rate at 5 years of:0.511.52  <response>: Ans. is a, i.e. 0.5Ref: Leon Speroff 7thed, p981LNG - IUD has a pregnancy rate of 0.2 100 women years HWY here nearest is 0.5 so that is the answer. 