This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Varicose Veins, Subject name: Surgery
[{'content': 'Most commonly varicose veins are seen with : \nSelect and explain. \nA. Long saphenous vein, B. Short saphenous vein, C. Both, D. popliteal and femoral vein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' ie. long saphenous vein (Schwart, 7/e, p 1021) (not mentioned in 8/e)" The usual distribution of veins is below the knee in branches of the greater saphenous system*', 'role': 'assistant'}]