Complete the following sentence by filling in the blanks A and B.
....A..... Produced by a yeast .......B..... is used as a blood cholesterol-lowering agent.

Options

A. A - Cyclosporin , B - Monascus purpureus
B. A - Statins , B - Monascus purpureus
C. A - Statins , B - Trichoderma polysporum
D. A - Cyclosporin , B - Trichoderma polysporum

Answer

To complete the sentence, we need to identify the correct terms for blanks A and B based on the context of the question.

1. **Identify the blood cholesterol-lowering agent**: The question states that we are looking for a substance used as a blood cholesterol-lowering agent. From the information provided, we know that statins are a class of lipid-lowering medications that are commonly used to lower blood cholesterol levels.

2. **Identify the source of the cholesterol-lowering agent**: The transcript mentions that statins are produced by a yeast. The specific yeast mentioned is Monascus purpureus, which is known for producing statins.

3. **Fill in the blanks**:
- For blank A, we will fill in "Statins".
- For blank B, we will fill in "Monascus purpureus".

Putting it all together, the completed sentence reads: "Statins produced by a yeast Monascus purpureus is used as a blood cholesterol-lowering agent."

### Final Answer:
A: Statins
B: Monascus purpureus