Rennet is used in

Options

A. Bread making
B. Fermentation
C. Cheese making
D. Synthesis of antibiotics

Answer

### Step-by-Step Solution:

1. **Understanding Rennet**:
- Rennet is a complex of enzymes that is primarily found in the stomachs of ruminant mammals such as cows, goats, and sheep.

2. **Function of Rennet**:
- The main function of rennet is to aid in the digestion of milk. It helps in coagulating milk, which means it separates milk into solid curds and liquid whey.

3. **Application of Rennet**:
- The solid curds formed from the coagulation process are essential in the production of cheese. This is because the curds can be processed further to create various types of cheese.

4. **Evaluating the Options**:
- The question provides several options:
- Bread making
- Fermentation
- Cheese making
- Synthesis of antibiotics
- Among these, the option that aligns with the function of rennet is cheese making.

5. **Conclusion**:
- Therefore, the correct answer to the question "Rennet is used in" is **cheese making**.