**Core Concept**
The duct of Wirsung is a pancreatic duct that plays a crucial role in the digestive process by draining pancreatic juice into the duodenum. It is one of the two main pancreatic ducts, the other being the duct of Santorini. The duct of Wirsung is also known as the greater pancreatic duct.

**Why the Correct Answer is Right**
The duct of Wirsung is the main pancreatic duct that connects the pancreas to the duodenum, allowing pancreatic juice rich in digestive enzymes to flow into the small intestine. This process is essential for the digestion and absorption of nutrients from food. The duct of Wirsung is approximately 12-15 cm long and joins the common bile duct to form the ampulla of Vater, which opens into the second part of the duodenum. The pancreas produces both endocrine and exocrine secretions, with the exocrine secretions being drained through the duct of Wirsung.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the duct of Wirsung, as it is not associated with the pancreatic ducts.
**Option B:** This option refers to the duct of Santorini, which is a smaller pancreatic duct that drains the head of the pancreas.
**Option C:** This option is incorrect as it refers to the common bile duct, which is a separate duct that carries bile from the liver and gallbladder into the duodenum.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that the duct of Wirsung is the main pancreatic duct, and its obstruction can lead to pancreatitis. The ampulla of Vater, formed by the junction of the duct of Wirsung and the common bile duct, is a common site for tumors and gallstones to cause obstructive jaundice.

**Correct Answer: C. Common Bile Duct.**