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: Gynaecology & Obstetrics
[{'content': 'Contraception of choice for a post paum village woman with one child : \nSelect and explain. \nA. Barrier, B. Copper T, C. Oral pills, D. Spermicide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Copper T', 'role': 'assistant'}]