This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral Arterial Occlusive Disease, Subject name: Surgery
Best graft for femoropopliteal bypass - 
Select and explain. 
A. Dacron, B. Saphenous vein, C. PTFE, D. None
B: Saphenous vein
Answer: B: Saphenous vein 
Explanation: Ans. is 'b' i.e.. Saphenous vein o Dacron is the femoral material for aortiliac work, it gives excellent results. For bypass in the femoropopliteal region, if autogenous vein is not available, PTFE or glutaraldehyde-tanned, Dacron-supported, human umblical vein may be employed.