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': 'True regarding course of great saphenous vein is all except \nSelect and explain. \nA. Begins at the saphenous opening, B. Runs along posteromedial aspect of knee joint, C. Associated with saphenous nerve in lower part of leg, D. Posterior arch vein is one of its tributaries', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Great saphenous vein begins from medial part of dorsal venous arch of foot.', 'role': 'assistant'}]