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
[{'content': 'The contraceptive TODAY which has been recently introduced contains : \nSelect and explain. \nA. Prostaglandin F2, B. Norethisterol, C. 9 - Nonoxynol, D. Copper releasing mesh', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 9 - Nonoxynol', 'role': 'assistant'}]