The product of which of the following organsims has been commercialised as blood cholesterol lowering agent:

Options

A. Trichoderma polysporum
B. Monascus purpureus
C. Saccharomyces cerevisiae
D. Aspergillus niger

Answer

To determine which organism's product has been commercialized as a blood cholesterol-lowering agent, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which organism has a product that is used to lower blood cholesterol levels. This typically refers to substances known as statins.

2. **Identify the Options**: The options provided are:
- Trichoderma polyspora
- Monascus purpurus
- Saccharomyces cerevisiae
- Aspergillus niger

3. **Research Each Organism**:
- **Trichoderma polyspora**: This fungus is known for producing cyclosporine A, which is an immunosuppressive agent. It is not related to cholesterol-lowering.
- **Monascus purpurus**: This is a fungus that is known for producing statins, specifically lovastatin, which is used to lower cholesterol levels. This is a potential correct answer.
- **Saccharomyces cerevisiae**: This yeast is primarily used in fermentation processes, particularly for producing alcohol. It does not produce cholesterol-lowering agents.
- **Aspergillus niger**: This fungus is primarily used for the production of citric acid and does not have a role in lowering cholesterol.

4. **Conclude**: Based on the research, Monascus purpurus is the organism that produces a product (statins) that has been commercialized as a blood cholesterol-lowering agent.

5. **Final Answer**: The correct answer is **Monascus purpurus**.