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: Anatomy
[{'content': 'Sho saphenous vein in a tributary of: \nSelect and explain. \nA. Medial marginal vein, B. Lateral marginal vein, C. Posterior tibial vein, D. Dorsal venous arch', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lateral marginal vein', 'role': 'assistant'}]