This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pediatrics
Ligamentum teres of the liver is a remnant of ________ 
Select and explain. 
A. Umbilical aeries, B. Umbilical vein, C. Ductus venosus, D. Ductus aeriosus
B: Umbilical vein
Answer: B: Umbilical vein 
Explanation: Ligamentum teres is a remnant of the umbilical vein. The vessels that are occluded soon after bih are in due to course replaced by fibrous tissue and forms the following ligaments: Fetal structure Adult structure Foramen ovale Fossa ovalis Umbilical vein Ligamentum teres Ductus venosus Ligamentum venosum Umbilical aeries Medial umbilical ligaments Ductus aeriosus Ligamentum aeriosum Note: the median umbilical ligament or Xander&;s ligament represents the remnant of the embryonic urachus The lateral umbilical ligaments are folds of peritoneum over the inferior epigastric aeries Ref: Nelson textbook of pediatrics 21st edition Pgno: 975