Rennin used in cheese indusry is

Options

A. Antibiotic
B. Enzyme
C. Alkaloid
D. Inhibitor

Answer

To answer the question "Rennin used in the cheese industry is:", we will analyze the options provided and determine the correct classification of rennin.

### Step-by-Step Solution:

1. **Understanding Rennin**: Rennin is a substance that is primarily known for its role in the digestion of milk proteins. It is specifically involved in the coagulation of milk, which is a crucial step in cheese production.

2. **Identifying the Nature of Rennin**: Rennin is an enzyme that acts on casein, the main protein found in milk. It helps in curdling milk, which is essential for cheese making.

3. **Analyzing the Options**:
- **Antibiotic**: This is a substance that kills or inhibits the growth of bacteria. Rennin does not fit this definition.
- **Enzyme**: This is a biological catalyst that speeds up chemical reactions. Since rennin facilitates the digestion of milk proteins, this option is a strong candidate.
- **Alkaloid**: Alkaloids are a class of compounds that are mostly derived from plants and have significant pharmacological effects. Rennin does not belong to this category.
- **Inhibitor**: An inhibitor is a substance that slows down or prevents a particular chemical reaction. Rennin does not function in this manner.

4. **Conclusion**: Based on the analysis, rennin is classified as an enzyme because it catalyzes the digestion of milk proteins, specifically casein, during cheese production.

5. **Final Answer**: Therefore, the correct answer is that rennin used in the cheese industry is an **enzyme**.