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: Surgery
[{'content': 'Which is not used in treatment of superficial venous thrombosis -a) Immediate anticoagulationb) Rest and elevationc) Analgesicsd) Treat assosiated malignancy \nSelect and explain. \nA. ac, B. ab, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 1) Patient should not be kept at bed rest 2) Anti coagulation therapy is used when thrombus extends proximally to within 1 cm of the saphenofemoral junction to prevent the extension into femoral vein.', 'role': 'assistant'}]