<prompt> Ligamentum teres is formed after :Obliteration of the umbilical veinObliteration of the ductus venousObliteration of the ductus aeriosusObliteration of the hypogastric aery  <response>: Intraabdominal remnants of Umbilical vein forms the ligamentum teres. The more distal poions of the hypogastric aeries,which course from the level of the bladder along the abdominal wall to the umbilical ring and into the cord as umbilical aeries,undergo atrophy and obliterates within 3-4 days after bih, becomes umbilical ligaments. The Ductus venosus constricts by 10-96 hours after bih and is anatomically closed by 2-3 weks, resulting in the formation of ligamentum venosum. Reference: Williams Textbook of Obstetrics 4th edition, page 137 