This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Placenta, Fetal Membranes, Birth Defects, and Twinning, Subject name: Anatomy
Ligamentum teres develops from? 
Select and explain. 
A. Umbilical artery, B. Umbilical vein, C. Ductus venosus, D. Portal radicles
B: Umbilical vein
Answer: B: Umbilical vein 
Explanation: ANSWER: (B) Umbilical veinREF: Keith L Moore, 4th edition page 167"In anatomy, the round ligament of liver (AKA: ligamentum teres - or more specifically ligamenturn teres hepatis as the human body has three round ligaments in total) is a degenerative string of tissue that exists in the free edge of the falciform ligament of the liver. The round ligament represents the remnant of the fetal left umbilical vein"