<prompt> Ligamentum teres is formed after:Obliteration of the umbilical veinObliteration of the ductus venousObliteration of the ductus arteriosusObliteration of the hypogastric artery  <response>: Ans. is a, i.e. Obliteration of the umbilical veinVesselRemnantUmbilical arteryMedial umbilical ligamentLeft umbilical veinLigamentum teres of the liver 