The correct answer is option 2: Liver. Bile is a yellow-green fluid that is produced by the liver. It is an important component of the digestive system as it helps in the breakdown and absorption of dietary fats. The liver produces bile continuously and stores it in the gallbladder. When we eat a fatty meal, the gallbladder releases the stored bile into the small intestine through the bile duct. This bile helps to emulsify the fats, making it easier for enzymes to break them down into smaller molecules for absorption. Option 1, Gall bladder, is incorrect because the gallbladder stores the bile produced by the liver, but it does not secrete it. Option 3, Bile duct, is incorrect because it is the passageway through which bile flows from the liver and gallbladder to the small intestine, but it does not secrete bile itself. Option 4, Pancreas, is incorrect because the pancreas produces digestive enzymes, but not bile.