Which of the following disease is caused by a group of viruses called retrovirus, which have an envelope enclosing RNA genome?

Options

A. Tuberculosis
B. cholera
C. measles
D. AIDS

Answer

To determine which disease is caused by a group of viruses called retroviruses, we can analyze the options provided:

1. **Tuberculosis (TB)**: This disease is caused by bacteria, specifically *Mycobacterium tuberculosis*. Since TB is bacterial and not viral, this option is incorrect.

2. **Cholera**: Cholera is also a bacterial disease, caused by the bacterium *Vibrio cholerae*. As with TB, this option is incorrect because we are looking for a viral disease.

3. **Measles**: Measles is indeed caused by a virus, and its genetic material is RNA. However, measles is not caused by retroviruses; it belongs to a different group of viruses. Therefore, this option is also incorrect.

4. **AIDS**: AIDS (Acquired Immunodeficiency Syndrome) is caused by the Human Immunodeficiency Virus (HIV). HIV is a retrovirus, which means it has an envelope and an RNA genome. Retroviruses are characterized by their ability to reverse transcribe their RNA into DNA using an enzyme called reverse transcriptase. This makes AIDS the correct answer.

Thus, the disease caused by a group of viruses called retroviruses, which have an envelope enclosing an RNA genome, is **AIDS**.

### Summary of Steps:
1. Analyze each option to determine if it is caused by a virus or bacteria.
2. Identify the specific pathogens responsible for each disease.
3. Confirm whether the viral diseases belong to the retrovirus group.
4. Conclude that AIDS is the disease caused by retroviruses.