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: Social & Preventive Medicine
[{'content': 'On an average failure rate in the couples using condom is about - \nSelect and explain. \nA. 0-5 percent, B. 10-20 percent, C. 30-40 percent, D. 50 percent or more', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., 10-20% Condom o Condom is the most widely known and used barrier device by the males around the world. o Condom prevents the semen from being deposited in vagina. o The effectiveness of a condom may be increased by using it in conjunction with a spermicidal, jelly inseed into the vagina before intercourse. The spermicide serves as additional protection in the unlikely event that the condom should slip off or tear. o Failure rates vary from 2-3 per 100 women years to more than 14 in typical users.", 'role': 'assistant'}]