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 method with a failure rate of <5 is \nSelect and explain. \nA. Oral contraceptive pills, B. Copper-T, C. Vaginal sponge, D. Condom', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The oral contraceptives are highly effective contraceptive method\nThe failure rate is very low ( 0.3℅), as ovulation is inhibited', 'role': 'assistant'}]