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': "Least effective tuba! sterilization procedure Is : \nSelect and explain. \nA. Laparoscopic young's ring method, B. Hysteroscopic occlusion, C. Pomeroy's method, D. Vaginal fimbriectomy", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hysteroscopic occlusion', 'role': 'assistant'}]