Which one is not included in the category of physiological barriers to prevent microbial growth?

Options

A. Acid in the Stomach
B. Saliva in the Mouth
C. Tears from Eyes
D. Virus-infected cells secrete Interferons

Explanation

### Step-by-Step Solution

1. **Understand the Question**: The question asks which option is not categorized as a physiological barrier that prevents microbial growth.

2. **Define Physiological Barriers**: Physiological barriers are components of the innate immune system that act as the first line of defense against pathogens. They help prevent or block the entry of microbes into the body.

3. **Analyze Each Option**:
- **Option A: Acid in the Stomach**: The stomach produces hydrochloric acid (HCl), which kills bacteria and prevents their entry. This is a physiological barrier.
- **Option B: Saliva in the Mouth**: Saliva contains lysozyme, an enzyme that breaks down bacterial cell walls, thus preventing bacterial growth. This is also a physiological barrier.
- **Option C: Tears from the Eyes**: Tears also contain lysozyme, which helps kill bacteria and protect the eyes from infection. This qualifies as a physiological barrier.
- **Option D: Virus Infected Cells Secrete Interferons**: Interferons are proteins released by virus-infected cells to inhibit viral replication and activate immune responses. This is not a physiological barrier; it is part of the immune response.

4. **Conclusion**: Based on the analysis, the option that is not included in the category of physiological barriers is **Option D: Virus infected cells secrete interferons**.

### Final Answer
**D: Virus infected cells secrete interferons**

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