Which of the following disease is characterized by damage to alveolar sac and is treated by the protein `alpha - 1` antitrypsin ?

Options

A. Cancer
B. Rhematiod arthritis
C. Emphysema
D. ADA deficiency disease in children

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks for a disease characterized by damage to the alveolar sac and treated with the protein alpha-1-antitrypsin.

2. **Identifying the Options:**
The options provided are:
- Cancer
- Rheumatoid arthritis
- Emphysema
- ADA deficiency disease in children

3. **Analyzing Each Option:**
- **Cancer:** This is a broad term for diseases involving abnormal cell growth. It does not specifically relate to alveolar damage or alpha-1-antitrypsin treatment.
- **Rheumatoid arthritis:** This is an autoimmune condition affecting joints, not the lungs or alveolar sacs.
- **Emphysema:** This is a chronic lung condition that involves the damage and rupture of the alveolar sacs (air sacs) in the lungs, leading to difficulty in breathing. It is often associated with a deficiency of alpha-1-antitrypsin, which protects the lungs from damage.
- **ADA deficiency disease:** This is a genetic disorder affecting the immune system, not specifically related to alveolar damage.

4. **Conclusion:**
Based on the analysis, the disease characterized by damage to the alveolar sac and treated with alpha-1-antitrypsin is **Emphysema**.

**Final Answer: Emphysema**

---