This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
[{'content': "Cocket & Dodd's operation is performed for which one of the following ? \nSelect and explain. \nA. Sapheno femoral flush ligation, B. Subfascial ligation, C. Deep vein thrombosis, D. Diabetic foot", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref: BMJ 97 p314 Cockett and Dodd operation : Sub-fascial ligation of perforators Ref: www.ncbi.nlm.gov/pubmed/4855162', 'role': 'assistant'}]