**Core Concept**
Colipase is a crucial enzyme involved in the digestion of dietary triglycerides. It facilitates the action of pancreatic lipase by binding to the surface of dietary fats, thereby stabilizing the enzyme and allowing it to break down triglycerides into monoglycerides and free fatty acids.

**Why the Correct Answer is Right**
The correct answer is C. Pancreatic juice because colipase is secreted by the pancreas and plays a vital role in the digestion of fats in the small intestine. Pancreatic juice contains a mixture of enzymes, including amylase, lipase, and trypsin, which work together to break down carbohydrates, fats, and proteins into their constituent parts. Colipase is specifically responsible for enhancing the activity of pancreatic lipase, allowing it to effectively break down triglycerides.

**Why Each Wrong Option is Incorrect**
**Option A:** Saliva does not contain colipase, as it is primarily involved in the initial breakdown of carbohydrates and proteins in the mouth.
**Option B:** Bile, produced by the liver and stored in the gallbladder, contains bile salts that emulsify fats, making them more accessible to pancreatic lipase and colipase. However, bile itself does not contain colipase.
**Option D:** Succus entericus, also known as intestinal juice, is secreted by the small intestine and contains enzymes such as aminopeptidase and lactase. However, it does not contain colipase.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that colipase is a pancreatic enzyme that works in conjunction with pancreatic lipase to break down dietary fats. Deficiencies in either enzyme can lead to malabsorption of fats and related symptoms.

**✓ Correct Answer: C. Pancreatic juice**