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: Medicine
[{'content': 'The treatment of choice in recurrent venous thrombosis leading to pulmonary embolism despite intensive anticoagulation is: \nSelect and explain. \nA. Fibrinolysis treatment with tissue plasminogen activator, B. Pulmonary embolectomy, C. Pulmonary thromboendaerectomy, D. Inferior vena caval filters', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The two indications for inseion of an IVC filter are (1) active bleeding that precludes anticoagulation and (2) recurrent venous thrombosis despite intensive anticoagulation. Ref: Harrisons Principles of Internal Medicine, 18th Edition, Page 2176.', 'role': 'assistant'}]