Name the type of microorganisms which cause the following diseases :
Common cold

Explanation

**Step-by-Step Solution:**

1. **Understanding Microorganisms**: Microorganisms are tiny organisms that cannot be seen with the naked eye. They include various types such as viruses, bacteria, fungi, and protozoa.

2. **Identifying the Disease**: The question specifically asks about the common cold, which is often referred to as the common flu.

3. **Determining the Causative Agent**: To find out what causes the common cold, we need to identify the type of microorganism responsible for it.

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