The enzyme that is secreted in an inactive form is:

Options

A. Lipase
B. trypsin
C. nuclease
D. ptyalin

Explanation

To answer the question about which enzyme is secreted in an inactive form, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in the body. They are usually proteins that can be activated or deactivated.

2. **Inactive Form of Enzymes**: Some enzymes are secreted in an inactive form to prevent them from digesting the tissues where they are produced. This is a protective mechanism.

3. **Identifying the Enzyme**: One of the well-known enzymes that is secreted in an inactive form is **pepsinogen**. Pepsinogen is the inactive precursor of pepsin, which is an enzyme that helps in the digestion of proteins in the stomach.

4. **Activation of Pepsinogen**: Pepsinogen is activated to pepsin when it comes into contact with the acidic environment of the stomach (specifically, hydrochloric acid). This ensures that the enzyme is only active when it is needed for digestion.

5. **Conclusion**: Therefore, the enzyme that is secreted in an inactive form is **pepsinogen**.

### Final Answer:
The enzyme that is secreted in an inactive form is **pepsinogen**.

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