Which of the following hormone is responsible for the release of bile from the gall bladder

Relaxation of which of the following is responsible for release of bile from common bile duct into pancreatic duct?

Relaxation of which of the following is responsible for release of bile from common bile duct into pancreatic duct?

Which of the following hormones is released by duodenum and acts on gall bladder?

Name the duct arise from gall bladder.

There is no gall bladder in

An animal without gall bladder