Bile is stored and concentrated in the:

Bile is stored and concentrated in the gall bladder, which serves as a reservoir for bile produced by the liver. The gall bladder absorbs water and salts from the bile, making it more concentrated in bile acids, pigments, and cholesterol. When food enters the small intestine, particularly fatty foods, the gall bladder contracts and releases the concentrated bile into the small intestine to aid in the digestion and absorption of fats.

The liver is responsible for the production of bile, but it does not store it. The pancreas produces digestive enzymes and hormones such as insulin, but it does not have a role in bile storage. The intestines play a critical role in digestion, but they do not store bile either; rather, they are where bile acts to emulsify fats. This makes the gall bladder the correct choice for the storage and concentration of bile.