This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Most commonly varicose veins are seen with ? \nSelect and explain. \nA. Long saphenous vein, B. Sho saphenous vein, C. Both, D. popliteal and femoral vein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans is \'a\' ie. long saphenous vein " The usual distribution of varicose veins is below the knee in branches of the greater saphenous system."', 'role': 'assistant'}]