Name the type of microorganisms which cause the following diseases :
Plague

Explanation

### Step-by-Step Solution

1. **Identify the Disease**: The disease in question is the Plague.

2. **Determine the Type of Microorganism**: The Plague is caused by a specific type of microorganism. In this case, it is a bacterium.

3. **Name the Causative Agent**: The bacterium that causes the Plague is called *Yersinia pestis*.

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