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': 'Brodie-Trendelenburg test is positive in: September 2010 \nSelect and explain. \nA. Deep vein thrombosis, B. Sapheno-femoral incompetence, C. Thromboangitis obliterans, D. Below-knee perforators incompetency', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Sapheno-femoral Incompetence A test to assess the competence of the sapheno-femoral junction (sfj). Some textbooks refer to the trendelenburg test and the tourniquet test interchangeably. However, other sources describe the trendelenburg test as being essentially identical to the tourniquet test, but finger pressure is used to occlude the sfj instead of a tourniquet', 'role': 'assistant'}]