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': 'Ligamentum teres hepatis is derivative of: \nSelect and explain. \nA. Ductus aeriosus, B. Ductus venosus, C. Umbilical vein, D. None of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: After bih, the left umbilical vein and ductus venosus are obliterated and form the ligamentum teres hepatis and ligamentum venosum, respectively. Ref: Langman's embryology 11th edition Chapter 12.", 'role': 'assistant'}]