Ductus choledochus is formed when
cystic duct of the gallbladder combines with the common hepatic duct of the liver
rivinus duct of gallbladder combines with hepatic duct of liver
hepatic duct of gallbladder combines with cystic duct of liver
right hepatic duct of liver combines with left hepatic duct of liver
Gallbladder -
The cystic duct of the gallbladder combines with the common hepatic duct of the liver and forms the common bile duct also known as Ductus Choledochus. Hence, the correct answer is option a.