This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Anatomy
[{'content': 'Ligamentum teres is the remnant of \nSelect and explain. \nA. Umbilical vein, B. Portal vein, C. Ductus venosus, D. Umbilical artery', 'role': 'user'}, {'content': "Answer: A \nExplanation: (A) Umbilical vein SOME FREQUENTLY ASKED REMNANTS* Ductus arteriosusLigamentum arteriosum* Ductus venosusLigamentum venosum* Left umbilical veinLigamentum teres of liver* Right umbilical veinDisappears* Vitello-intestinal ductMeckel's diverticulum* Wolffian ductGartner duct> After obliteration, the umbilical vein forms the ligamentum teres and the ductus venosus becomes ligamentum venosum.", 'role': 'assistant'}]