This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'Which of the following contraceptive methods has a failure rate of less than 5 in 100 woman \nSelect and explain. \nA. Vaginal sponge, B. Copper T, C. Diaphragm, D. Condom', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans b Sheila balakrishnan pg342Pearl Index = Pregnancy rate/lOOwoman years rings (combined estrogen, progesterone ring)-0.3%Emergency contraception - Levonorgestrel -1.1%Yuzpee regimen 3.2%Copper TCuT.380A, Mirena "0.2%Male condoms-12%', 'role': 'assistant'}]