Name the group of viruses responsible for causing AIDS in humans. Why are these viruses so named?

Explanation

### Step-by-Step Solution:

1. **Identify the Group of Viruses**: The group of viruses responsible for causing AIDS in humans is known as the Human Immunodeficiency Virus (HIV).

2. **Explain the Meaning of AIDS**: AIDS stands for Acquired Immunodeficiency Syndrome. This condition leads to a weakened immune system in affected individuals.

3. **Classify the Virus**: HIV belongs to a special category of viruses called retroviruses.

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