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': 'Best method of contraception in a commercial sex worker- \nSelect and explain. \nA. IUCD, B. OCP, C. Permanent sterilization, D. Barrier methods', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Barrier methods Barrier method provide protection against S.TD", 'role': 'assistant'}]