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
Which one of the following intrauterine contraceptive devices has the lowest pregnancy rate 
Select and explain. 
A. Lippes loop, B. Cu - 7, C. Cu T - 200, D. Levonorgestrel IUD
D: Levonorgestrel IUD
Answer: D: Levonorgestrel IUD 
Explanation: Levonorgestrel IUD