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
IUD Cu 7380A life span is : 
Select and explain. 
A. 1 year, B. 4 year, C. 5 year, D. 10 year
D: 10 year
Answer: D: 10 year 
Explanation: 10 year