`{:(,,"Column I","Column II"),(,I,"Aspergillus niger","A. Lactic acid"),(,II, "Lactobacillus","B. Butyric acid"),(,III,"Clostridium butylicum","C. Citric acid"),(,IV,"Trichoderma polysporum","D. Cyclosporin A"):}`
Which of the combinations is correct?

Options

A. I-B, II-A, III-D, IV-C
B. I-C, II-A, III-B, IV-D
C. I-A, II-B, III-C, IV-D
D. I-D, II-B, III-A, IV-C

Answer

To solve the question of matching the organisms from Column I with their respective products or uses in Column II, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Aspergillus niger**:
- Aspergillus niger is a fungus known for its ability to produce citric acid, which is commonly found in citrus fruits like lemons.
- **Match**: Aspergillus niger → C. Citric acid.

2. **Identify Lactobacillus**:
- Lactobacillus is a type of bacteria that is crucial in the fermentation process, particularly in converting lactose (found in milk) into lactic acid, which is the main component of yogurt.
- **Match**: Lactobacillus → A. Lactic acid.

3. **Identify Clostridium butylicum**:
- Clostridium butylicum is a bacterium that is associated with the production of butyric acid, often found in spoiled food and is involved in anaerobic fermentation.
- **Match**: Clostridium butylicum → B. Butyric acid.

4. **Identify Trichoderma polysporum**:
- Trichoderma polysporum is a fungus that is known for producing cyclosporin A, an immunosuppressive agent used in organ transplants to prevent rejection.
- **Match**: Trichoderma polysporum → D. Cyclosporin A.

### Final Combinations:
- I. Aspergillus niger → C. Citric acid
- II. Lactobacillus → A. Lactic acid
- III. Clostridium butylicum → B. Butyric acid
- IV. Trichoderma polysporum → D. Cyclosporin A

### Conclusion:
The correct combinations are:
- I - C
- II - A
- III - B
- IV - D

Thus, the correct answer is **Option 2**.

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