Which of the following does not occur in digestive system?

Options

A. Lingual lipase
B. Gastric lipase
C. Pancreatic lipase
D. Biliary lipase

Answer

To determine which of the following does not occur in the digestive system, we will analyze each option provided, focusing on the types of lipases mentioned.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks us to identify which lipase does not occur in the digestive system. Lipases are enzymes that help in the digestion of fats.

2. **Evaluate the Options**:
- **Option 1: Lingual Lipase**: This enzyme is secreted by the glands in the tongue and begins the digestion of fats in the mouth. Since it is produced in the tongue, it is part of the digestive system.
- **Option 2: Gastric Lipase**: This enzyme is secreted in the stomach and aids in fat digestion. As it is produced in the stomach, it is also part of the digestive system.
- **Option 3: Pancreatic Lipase**: This enzyme is produced by the pancreas and is released into the small intestine to help digest fats. Since it originates from the pancreas and functions in the digestive process, it is part of the digestive system.
- **Option 4: Biliary Lipase**: This enzyme is associated with bile, which is produced in the liver. Although bile plays a role in digestion, the liver itself is not part of the digestive tract. Therefore, biliary lipase does not directly occur in the digestive system.

3. **Conclusion**: After analyzing all four options, we find that the **biliary lipase** is the only enzyme that does not occur in the digestive system, as it is associated with the liver, which is not part of the digestive tract.

### Final Answer:
The correct answer is **biliary lipase**.

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