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': '"Today" sponge contains which of the following: \nSelect and explain. \nA. Nonoxynol, B. Deflon, C. Femshield, D. Desogestrel', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nonoxynol', 'role': 'assistant'}]