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
Cocket & Dodd's operation is performed for which one of the following ? 
Select and explain. 
A. Sapheno femoral flush ligation, B. Subfascial ligation, C. Deep vein thrombosis, D. Diabetic foot
B: Subfascial ligation
Answer: B: Subfascial ligation 
Explanation: Ref: BMJ 97 p314 Cockett and Dodd operation : Sub-fascial ligation of perforators Ref: www.ncbi.nlm.gov/pubmed/4855162