Which enzyme will be absent in gastic secretion of a 22 years old man-pepsin, pepsinogen, mucus rennin?

Explanation

To determine which enzyme is absent in the gastric secretion of a 22-year-old man, we need to analyze the options provided: pepsin, pepsinogen, mucus, and renin.

### Step-by-Step Solution:

1. **Understanding Gastric Secretions**: Gastric secretions in the stomach include various enzymes and substances that aid in digestion. The primary enzymes involved in protein digestion are pepsin and pepsinogen.

2. **Identifying the Role of Each Option**:
- **Pepsin**: This is an active enzyme that helps in the digestion of proteins into smaller peptides.
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