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: Gynaecology & Obstetrics
Ligamentum teres is formed from which of the following embryologic structure? 
Select and explain. 
A. Umbilical aery, B. Umbilical vein, C. Urachus, D. Persistent vitellointestinal duct
B: Umbilical vein
Answer: B: Umbilical vein 
Explanation: Ligamentum teres of the liver is a remnant of left umbilical vein. Medial umbilical ligaments is a remnant of Umbilical aeries. Ligamentum venosum is a remnant of ductus venosus. Ligamentum aeriosum is a remnant of ductus aeriosus. Ref: Human Embryology 6th Ed Page 259.