**Core Concept**
Pancreatic lipase is a crucial enzyme responsible for the breakdown of triglycerides into fatty acids and glycerol during lipid digestion. This process occurs in the small intestine, where pancreatic juice containing lipase is secreted into the lumen to facilitate nutrient absorption.

**Why the Correct Answer is Right**
Pancreatic lipase requires bile salts to activate its activity, facilitating the hydrolysis of triglycerides into monoglycerides and free fatty acids. This is because bile salts emulsify fats, increasing their surface area and allowing lipase to bind and cleave the triglyceride molecule. The presence of bile salts also stabilizes the lipase enzyme, enabling it to maintain its active conformation and effectively break down lipids.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option would be incorrect as there is no direct evidence that pancreatic lipase requires calcium ions to function. While calcium ions are essential for many enzymatic reactions, they are not specifically required for lipase activity.
* **Option B:** This option would be incorrect as pancreatic lipase does not require a specific pH range to function. Lipase activity is optimal in a slightly alkaline environment, but it can function within a relatively broad pH range.
* **Option C:** This option would be incorrect as pancreatic lipase does not require a cofactor such as ATP to function. Lipase is a hydrolase enzyme that breaks down triglycerides without the need for energy input in the form of ATP.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the activation of pancreatic lipase by bile salts is a critical step in lipid digestion. This process highlights the importance of the gastrointestinal tract's complex interplay between enzymes, bile salts, and nutrients to facilitate optimal nutrient absorption.

**Correct Answer:** C. Bile salts