Which one of the following is an incorrrect pair?

Options

A. Louis - Coined the term 'virus'
B. Beijerinck-contagium vivium fluidum
C. Ivanovsky-Discovered retroviruses
D. Stanley-Crystallised TMV

Explanation

To determine which of the following pairs is incorrect, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Identify the first pair**:
- **Louis** coined the term **virus**.
- This statement is **correct**. Louis Pasteur is credited with coining the term "virus" to describe infectious agents.

2. **Identify the second pair**:
- **Ben** Drink Contagion with **Freedom**.
- This statement is also **correct**. Benjamin (Ben) is recognized for his work on viruses, referring to them as "Contagion Within".

3. **Identify the third pair**:
- **Iwanoski** discovered **retrovirus**.
- This statement is **incorrect**. Iwanoski is known for discovering the cause of the tobacco mosaic disease, not retroviruses. Retroviruses were discovered later by other scientists.

4. **Identify the fourth pair**:
- **Stanley** crystallizes the **TMV** (Tobacco Mosaic Virus).
- This statement is **correct**. Stanley was the first to crystallize the Tobacco Mosaic Virus, demonstrating that viruses could retain their infectivity even after crystallization.

5. **Conclusion**:
- The incorrect pair among the options is the third one: **Iwanoski discovered retrovirus**.

### Final Answer:
The incorrect pair is: **Iwanoski discovered retrovirus**.

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