Which micro - organism is utilised in making curd from milk ?

Options

A. Staphylococcus
B. Bacillus
C. Streptococcus
D. Lactobacillus

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which microorganism is used to make curd from milk. This indicates that we need to identify a specific type of microorganism involved in this process.

2. **Identifying the Microorganism**: The primary microorganism responsible for the fermentation of milk into curd is a type of bacteria. The most common bacteria used for this purpose are from the genus *Lactobacillus*.

3. **Role of Lactobacillus**: *Lactobacillus* bacteria are beneficial and play a crucial role in the fermentation process. They convert lactose (the sugar in milk) into lactic acid, which helps in thickening the milk and giving curd its characteristic taste and texture.

4. **Exclusion of Other Options**: The question may provide other options (like Staphylococcus or Bacillus). It's important to note that:
- *Staphylococcus* is associated with infections and does not play a role in curd formation.
- *Bacillus* includes various strains, but they are not typically used for curd making.

5. **Conclusion**: Based on the information gathered, the correct answer to the question is *Lactobacillus*.

**Final Answer**: The microorganism utilized in making curd from milk is *Lactobacillus*.

---