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
All ICUD's are changed every 4-5 year except: 
Select and explain. 
A. Cu 280, B. Cu 320, C. Multiload devices, D. Progestasert
D: Progestasert
Answer: D: Progestasert 
Explanation: None