Lysozyme is

Options

A. Antiviral
B. Antibacterial
C. Antiprotozoan
D. All the above

Answer

**Step-by-Step Solution:**

1. **Definition of Lysozyme**: Lysozyme is an enzyme that is known for its ability to break down bacterial cell walls.

2. **Alternative Names**: It is also referred to as muramidase or N-acetyl muramide glycanhydrolase.

3. **Function**: The primary function of lysozyme is antibacterial. It targets the peptidoglycan layer in the bacterial cell wall, which is crucial for the structural integrity of bacteria.

4. **Role in Immune System**: Lysozyme is a part of the innate immune system, which is the body's first line of defense against pathogens.

5. **Sources of Lysozyme**: This enzyme is found abundantly in various bodily secretions, including tears, saliva, human milk, and mucus. It is also present in the cytoplasmic granules of immune cells such as macrophages and neutrophils.

6. **Conclusion**: Based on its functions and sources, lysozyme is primarily recognized as an antibacterial agent. Therefore, the correct answer to the question is option B: antibacterial.

---