Ligamentum teres hepatis is derivative of:
Ductus aeriosus
Ductus venosus
Umbilical vein
None of the above
After bih, the left umbilical vein and ductus venosus are obliterated and form the ligamentum teres hepatis and ligamentum venosum, respectively. Ref: Langman's embryology 11th edition Chapter 12.