This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
Chemical used in vaginal sponge is 
Select and explain. 
A. Ethynil estradiol, B. Progesterone, C. Mifepristone, D. Nonoxynol-9
D: Nonoxynol-9
Answer: D: Nonoxynol-9 
Explanation: Vaginal sponge is a small polyurethane foam sponge saturated with spermicide, nonoxynol-9 It comes under barrier method of contraception Reference : Park&;s textbook of preventive and social medicine, 23rd edition, Page no: 495