Select the incorrect match

Options

A. Aspergillus niger - Citric acid
B. Clostridium butylicum - Butyric acid
C. Streptococcus - Statin
D. Trichoderma polysporum - Cyclosporin A

Answer

To solve the question of selecting the incorrect match, we will analyze each option provided:

1. **Aspergillus niger and citric acid**:
- Aspergillus niger is a type of fungus known for its ability to produce citric acid. This is a correct match as citric acid is widely used in the food and pharmaceutical industries.

2. **Clostridium butylicum and butyric acid**:
- Clostridium butylicum is a bacterium that produces butyric acid. However, the statement mentions it is used in making rancid butter, which is misleading. While butyric acid is associated with rancid butter, Clostridium butylicum is not primarily known for this application. This could be considered an incorrect match depending on context.

3. **Streptococcus and statin**:
- Streptococcus is a genus of bacteria, but it does not produce statins. Instead, Streptococcus is known for producing streptokinase, which is used as a clot buster in medical treatments. Therefore, this is an incorrect match.

4. **Trichoderma polysporum and Cyclosporine A**:
- Trichoderma polysporum is a fungus that is known to produce Cyclosporine A, an immunosuppressive agent used in organ transplantation. This is a correct match.

Based on the analysis, the incorrect matches are:
- Clostridium butylicum and butyric acid (due to misleading context)
- Streptococcus and statin (definitely incorrect)

However, since the question asks for a single incorrect match, the most clear and definitive incorrect match is **Streptococcus and statin**.

### Final Answer:
The incorrect match is **Streptococcus and statin**.