This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
[{'content': 'On a average, failure rate in the couples using condom is about \nSelect and explain. \nA. 0 to 5 percent, B. 10 to 20 percent, C. 30 to 40 percent, D. 50 percent or more', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Condoms can be a highly effective method of contraception, if they are used correctly. Failure rates for the condom vary enormously. Survey has been repoed pregnancy rates bearing from 2 to 3 per 100 women years to more than 14 in typical users. Most failures are due to incorrect use Reference: Park&;s textbook of Preventive and social medicine 23rd edition; Page number 494', 'role': 'assistant'}]