This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Natural Methods, Barrier Methods, IUDs, OCPs, Subject name: Social & Preventive Medicine
[{'content': 'Taking into consideration typical usage patterns, the most effective spacing method provided under National Family Planning program is- \nSelect and explain. \nA. Cu-T 380 A, B. Mala-N, C. Nirodh, D. Non-Scalpel vasectomy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The most effective spacing method provided under National Family Planning program is CuT 380 A. Cu T 380 A has a failure rate of only 0.6-0.8/HWY, as compared to failure rate of Mala-N of 8/HWY and for condom of 10-14/HWY. NSV is not a spacing method.', 'role': 'assistant'}]