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
Commonest cause of Pelvic Inflammatory Die, ease is : 
Select and explain. 
A. TB, B. UTI, C. Fungus, D. Cu -- T
D: Cu -- T
Answer: D: Cu -- T 
Explanation: Cu -- T