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': 'Most preferable contraceptive device for a female suffering from Rheumatic Hea Disease who has completed her family is : \nSelect and explain. \nA. IUCD, B. Tubal ligation, C. Norplant, D. Barrier method', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tubal ligation', 'role': 'assistant'}]