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
Ligamentum teres develops from 
Select and explain. 
A. Umbilical aery, B. Umbilical vein, C. Ductus venosus, D. Poal radicles
B: Umbilical vein
Answer: B: Umbilical vein 
Explanation: Umbilical vein "In anatomy, the round ligament of liver (AKA: ligamentum teres - or more specifically ligamentum 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 ligamentrepresents the remnant of the fetal left umbilical vein"