In Beijerinek's experiment, what did he call the infectious fluid that he extracted from diseased tobacco plants ?

Options

A. Fluidum vivum contagium
B. Contagium vivum fluidum
C. Vivum fluidum contagium
D. Vivum contagium fluidum

Answer

To solve the question regarding what Beijerinek called the infectious fluid extracted from diseased tobacco plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**: Beijerinek conducted experiments in the late 19th century to study the infectious agents causing diseases in plants, particularly tobacco plants.

2. **Identify the Experiment**: In his experiments, Beijerinek took extracts from diseased tobacco plants and observed that this extract could infect healthy plants.

3. **Naming the Fluid**: Beijerinek referred to the infectious fluid extracted from the diseased tobacco plants as "Contagium vivum fluidum." This term translates to "living infectious fluid."

4. **Conclusion**: Therefore, the correct answer to the question is "Contagium vivum fluidum."

### Final Answer:
**Contagium vivum fluidum**

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