This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology, Subject name: Anatomy
Ligamentum teres is remnant of - 
Select and explain. 
A. Umbilical arteries, B. Left umbilical vein, C. Ductus-venosus, D. Ductus arteriosus
B: Left umbilical vein
Answer: B: Left umbilical vein 
Explanation: Ans. is 'b' i.e., Left umbilical vein o The ligament teres represents the obliterated left umbilical vein.Embryonic partRemnantsDuctus arteriosusLigamentum arteriosumUmbilical arteryProximal partSuperior vesical artery.Distal partMedial umbilical ligamentUmbilical veinLigament teresDuctus venosusLigamentum venosusSeptum primumFossa ovalisSeptum secondumAnnulus ovalis / Limbus fossa ovalis