This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'Regarding vascular surgery distal to popliteal artery, which of the following is true? \nSelect and explain. \nA. Suture with polypropylene, B. 6-0 suture used, C. Needle pass from within outwards, D. All the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. (d) All of the above(Ref: Bailey 26/e p44-45)Vascular anastomosis Points:* Most critical anastomosis of all tissues in vascular.* Needs fine suture and even operating microscope for smaller vessels* 2'0 size is used for Aorta, 4'0 is used for Femoral artery, 6'0 for medium sized arteries like Popliteal and tibial arteries.* Suture materials commonly used are Prolene, PDS or Dacron.* Knots must be secure.* The suture needle must always pass from Inside to Outside (Intima to outside)* It must be immediately watertight. No leak must be seen after anastomosis.Remember based on the thickness the suture materials are named as* 2'>1'>0>2'0>4'0>6'0>8'0(Finest material of the above is 8'0 and thickest is 2')", 'role': 'assistant'}]