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': 'NOT a cause of varicose veins: March 2013 (f) \nSelect and explain. \nA. Superficial venous thrombosis, B. Aeriovenous fistula, C. Deep venous thrombosis, D. Pregnancy', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. A i.e. Superficial venous thrombosis Varicose veins Gold standard method of diagnosing VV: Duplex imaging Sclerosant used in VV: Ethanolamine oleate Test to demonstrate sapheno-femoral incompetence: Brodie-Trendelenburg test MC complication of stripping: Ecchymosis Cocket & Dodds's operation: Subfascial ligation", 'role': 'assistant'}]