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
Best graft for femora-popliteal bypass is 
Select and explain. 
A. Autologus vein, B. Dacron, C. Teflon, D. PTF
A: Autologus vein
Answer: A: Autologus vein 
Explanation: Best graft for femoro popliteal bypass is autologous vein, long saphenous from same leg, if not available, from opposite limb, or else sho saphenous vein. If no vein is available, a prosthetic, polytetrafluoroethylene can be used. Best is autologous vein. Reference: Bailey and love, 27th edition, page 949