This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non-Hormonal - Barrier Methods, Subject name: Gynaecology & Obstetrics
Today vaginal sponge failure rate is? 
Select and explain. 
A. 5%, B. 9%, C. 16%, D. 20%
B: 9%
Answer: B: 9% 
Explanation: Ans. (b) 9%Ref: Appendix-115 for "METHODS OF CONTRACEPTION"