Which is correctly paired

Options

A. Aspergillus niger - Production of lactic acid
B. Trichoderma polysporum- Lowers blood cholesterol
C. Saccharomyces cerevisiae - Production of citric acid
D. Methanogenic bacteria - Gobar gas formation.

Answer

To determine which pair is correctly matched, we need to analyze each option provided in the question. Here’s a step-by-step breakdown of the solution:

### Step 1: Analyze the first option
- **Aspergillus niger**: This fungus is known for its ability to produce citric acid.
- **Given**: Lactic acid.
- **Conclusion**: This pairing is incorrect because Aspergillus niger produces citric acid, not lactic acid.

### Step 2: Analyze the second option
- **Trichoderma polysporum**: This fungus is known for its role in lowering blood cholesterol levels.
- **Given**: Lowering blood cholesterol levels.
- **Conclusion**: This pairing is correct as Trichoderma polysporum is indeed associated with lowering cholesterol.

### Step 3: Analyze the third option
- **Saccharomyces cerevisiae**: This yeast is primarily known for its role in the fermentation process, producing ethanol.
- **Given**: Citric acid.
- **Conclusion**: This pairing is incorrect because Saccharomyces cerevisiae produces ethanol, not citric acid.

### Step 4: Analyze the fourth option
- **Methanogens**: These are a group of archaea that produce methane.
- **Given**: Methanococcus or Methanobacteria responsible for methane formation.
- **Conclusion**: This pairing is incorrect as the term is not specific to the correct organisms mentioned.

### Final Conclusion
After analyzing all the options, the only correctly paired option is:
- **Option 2: Trichoderma polysporum - Lowering blood cholesterol levels.**