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': 'Left Umbilical vein becomes: \nSelect and explain. \nA. Ligamentum teres, B. Ligamentum venosum, C. Medial umbilical ligament, D. Ligamentum aeriosum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ligamentum teres', 'role': 'assistant'}]