What organ is responsible for producing bile?

The liver is the organ responsible for producing bile. Bile is a crucial digestive fluid that aids in the emulsification and absorption of fats in the small intestine. The liver synthesizes bile acids from cholesterol and secretes them into bile, which is then stored in the gallbladder until needed for digestion. This process not only facilitates fat digestion but also assists in the elimination of certain waste products.

The other options are involved in the digestive process but do not produce bile. The spleen is primarily involved in filtering blood and is part of the immune system. The gallbladder's main function is to store and concentrate bile produced by the liver until it is needed in the digestive process, while the pancreas produces digestive enzymes and hormones like insulin, but it does not create bile.