…………is used to produce a bioactive molecule which is used as an immunosuppressive agent in organ - transplant patients.

Options

A. Monascus
B. Clostridium
C. Streptococcus
D. Trichoderma

Answer

To solve the question, we need to identify which organism from the given options is used to produce a bioactive molecule that acts as an immunosuppressive agent in organ transplant patients.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for an organism that produces a bioactive molecule used as an immunosuppressive agent. Immunosuppressive agents are crucial in organ transplantation to prevent the body from rejecting the transplanted organ.

2. **Analyzing the Options**: The options provided are:
- A) Monascus
- B) Clostridium
- C) Streptococcus
- D) Trichoderma

3. **Identifying the Bioactive Molecule**: The bioactive molecule that is commonly known for its immunosuppressive properties in organ transplant patients is Cyclosporine A.

4. **Determining the Source of Cyclosporine A**: Cyclosporine A is produced by a specific fungus. The correct fungus that produces this bioactive molecule is Trichoderma polysporum.

5. **Selecting the Correct Answer**: Based on the information that Cyclosporine A is produced by Trichoderma, we can conclude that the correct answer to the question is:
- D) Trichoderma

### Final Answer:
**D) Trichoderma**