This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other FP Methods and New Initiatives in Family Planning, Subject name: Social & Preventive Medicine
[{'content': 'The failure rate of TODAY is lowest in: \nSelect and explain. \nA. Nullipara, B. Multipara, C. Grand multipara, D. Same in all (Does not depend on parity)', 'role': 'user'}, {'content': "Answer: A \nExplanation: - Today is a Vaginal sponge. Vaginal sponge It is a small polyurethane foam sponge measuring 5 cm x 2.5 cm, saturated with the spermicide, nonoxynol-9. The failure rate in parous women is between 20-40 per 100 women-years and in nulliparous women about 9-20 per 100 women years. Barrier method - Has a high failure rate; only consistent use for 2 years. - Has advantage of HIV/STI protection but a 'healthy' couple may not need it.", 'role': 'assistant'}]