Mismatch of the following is

Options

A. Lysozyme - prevention of infections
B. Oxyntic cells - HCI
C. Oxyntic cells - intrinsic factor
D. Parietal cells - pepsinogen

Answer

To solve the question regarding the mismatch among the given options, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Identify the Functions of Lysozyme**:
- **Lysozyme** is an enzyme that has antibacterial properties. It helps in preventing infections by breaking down the cell walls of bacteria. It is found in various secretions such as tears, saliva, and milk.
- **Match**: Lysozyme - Prevention of infections (Correct)

2. **Understand the Role of Oxyntic Cells**:
- **Oxyntic cells**, also known as parietal cells, are located in the stomach lining. They are responsible for the secretion of hydrochloric acid (HCl) and intrinsic factor, which are essential for digestion and absorption of vitamin B12.
- **Match**: Oxyntic cells - Secretion of HCl (Correct)

3. **Evaluate the Function of Gastric Chief Cells**:
- **Gastric chief cells** are responsible for the secretion of pepsinogen, which is an inactive precursor of the enzyme pepsin. Pepsinogen is converted to pepsin in the presence of hydrochloric acid.
- **Match**: Gastric chief cells - Secretion of pepsinogen (Correct)

4. **Check the Mismatch**:
- The question presents **parietal cells** as the source of pepsinogen. However, this is incorrect because pepsinogen is secreted by gastric chief cells, not parietal cells.
- **Mismatch**: Parietal cells - Pepsinogen (Incorrect)

### Conclusion:
The mismatch in the options provided is:
- **Parietal cells do not secrete pepsinogen; it is secreted by gastric chief cells.**

Thus, the answer to the question is that the fourth option is the mismatch.