Antiretroviral drugs are useful in the treatment of

Options

A. an RNA-containing viral-borne disease
B. lgE mediated allergy
C. Autoimmune disorders which affect joints
D. deficiency disease

Answer

To solve the question regarding the usefulness of antiretroviral drugs, we will analyze each option provided and determine which condition these drugs are designed to treat.

### Step-by-Step Solution:

1. **Understanding Antiretroviral Drugs**:
- Antiretroviral drugs are medications specifically designed to treat infections caused by retroviruses. The most well-known retrovirus is the Human Immunodeficiency Virus (HIV), which leads to Acquired Immunodeficiency Syndrome (AIDS).

**Hint**: Remember that antiretroviral drugs target retroviruses, particularly HIV.

2. **Analyzing the Options**:
- **Option A: RNA-containing viral bone disease**:
- Retroviruses, including HIV, contain RNA as their genetic material. Therefore, this option aligns with the function of antiretroviral drugs.

**Hint**: Look for keywords like "RNA" and "viral" when considering retroviruses.

- **Option B: IgE mediated allergy**:
- IgE mediated allergies are related to immune responses involving allergens, not viral infections. Antiretroviral drugs do not treat allergies.

**Hint**: Consider whether the condition is viral or immune-related.

- **Option C: Autoimmune disorder**:
- Autoimmune disorders occur when the immune system mistakenly attacks the body’s own cells. Antiretroviral drugs are not used for treating autoimmune diseases.

**Hint**: Autoimmune disorders are not caused by viruses, so they are not relevant for antiretroviral treatment.

- **Option D: Deficiency disease**:
- Deficiency diseases are caused by a lack of essential nutrients or vitamins, not by viral infections. Antiretroviral drugs do not address these conditions.

**Hint**: Deficiency diseases are unrelated to viral infections.

3. **Conclusion**:
- After analyzing all options, the correct answer is **Option A: RNA-containing viral bone disease**, as antiretroviral drugs are specifically used to treat diseases caused by RNA viruses like HIV.

### Final Answer:
Antiretroviral drugs are useful in the treatment of **RNA-containing viral bone disease**.