The organ that is connected by a duct to the duodenum is the:

The pancreas is the organ that connects to the duodenum through the pancreatic duct. This duct allows digestive enzymes produced by the pancreas to flow into the duodenum, where they play a crucial role in breaking down carbohydrates, fats, and proteins in the food we consume. The secretion of these enzymes is vital for proper digestion and nutrient absorption.

The gallbladder, while it stores bile produced by the liver, does not directly connect to the duodenum. Instead, bile is released from the gallbladder into the common bile duct, which then empties into the duodenum. The stomach, on the other hand, is involved in the initial stages of digestion but does not have a duct that connects directly to the duodenum; it empties its contents through the pyloric sphincter. The liver produces bile, which is important for digestion, but like the gallbladder, its connection to the duodenum is indirect through the bile ducts. Thus, the pancreas is the correct answer as it directly connects via its duct.