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': 'Conventional contraceptives are those which \nSelect and explain. \nA. Were discovered before 1960, B. Require action after intercourse, C. Require action at time of intercourse, D. Requires action before intercourse', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Conventional contraceptives : Methods that require action at the time of coitus Condoms Spermicides Jellies Conventional contraceptives does not mean older contraceptives Ref: Park 25th edition Pgno : 528', 'role': 'assistant'}]