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: Social & Preventive Medicine
Spermicide used in the contraceptive today: 
Select and explain. 
A. Norethinosterol, B. Nonoxynol, C. DMPA, D. NET-EN
B: Nonoxynol
Answer: B: Nonoxynol 
Explanation: Nonoxynol