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': 'Uterine aery embolisation is done by using: \nSelect and explain. \nA. Thrombin, B. Polyvinyl alcohol, C. Vitamin K, D. Iodine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Polyvinyl alcohol', 'role': 'assistant'}]