Which of the following is a source of single cell protein?
A. Saccharomyces
B. Torulopsis
C. Candida , D. Scenedesmus

Options

A. A and B
B. B and C
C. C and D
D. A, B,C

Answer

To determine which of the given options is a source of single-cell protein, we can analyze each option based on their characteristics and classifications.

### Step-by-Step Solution:

1. **Understanding Single Cell Protein (SCP)**:
- Single Cell Protein refers to the protein extracted from single-celled organisms such as bacteria, yeast, and algae. It is used as a protein supplement in animal feed and human food.

2. **Analyzing the Options**:
- **A. Saccharomyces**: This is a genus of yeast, commonly known for its role in baking and brewing. Yeasts like Saccharomyces can be a source of single-cell protein.
- **B. Torulopsis**: This is another genus of yeast. Similar to Saccharomyces, Torulopsis can also be utilized as a source of single-cell protein.
- **C. Candida**: This is a genus of yeast that includes species known for their pathogenicity. However, certain species of Candida can also be used as a source of single-cell protein.
- **D. Scenedesmus**: This is a genus of green algae. Algae are known to be a source of single-cell protein as well.

3. **Identifying the Correct Answers**:
- All four options (Saccharomyces, Torulopsis, Candida, and Scenedesmus) can be sources of single-cell protein. However, the question may be looking for specific examples that are commonly recognized for SCP production.

4. **Conclusion**:
- Based on the analysis, the correct answers are A (Saccharomyces), B (Torulopsis), C (Candida), and D (Scenedesmus) as they all can be sources of single-cell protein.

### Final Answer:
All of the following are sources of single-cell protein:
- A. Saccharomyces
- B. Torulopsis
- C. Candida
- D. Scenedesmus