What structure transports bile from the liver to the bile duct?

The correct answer is: common hepatic duct.

Explanation:

The common hepatic duct is a structure that is formed by the convergence of the left hepatic duct and the right hepatic duct (each of these ducts drain the bile from the respective regions of the liver). The common hepatic duct is part of the biliary tract.

The common hepatic duct, after draining the bile from the liver, joins the cystic duct that comes from the gallbladder and creates the common bile duct.

Common Hepatic duct

Explanation:

Bile is a greenish thick fluid that consists of a mixture of substances like salts, acids, pigments, cholesterol etc. It plays a very important role in aiding digestion in the digestive system. Bile is produced by the liver, which secretes it through the common hepatic duct (collection of the right and left hepatic ducts).

The common hepatic ducts connect with the cystic duct (another duct that links to the gall bladder). This connection brings about the formation of the bile duct. Hence, the common hepatic duct conducts or transport the bile from the liver to the bile duct, which eventually empty its content (bile) into the small intestine or gall bladder.