Which of the following is an autoimmune disease?

Options

A. Vitiligo
B. Alzheimer's disease
C. Rheumatoid arthritis
D. Psoriasis

Answer

**Step-by-Step Solution:**

1. **Understanding Autoimmune Diseases:**
- Autoimmune diseases occur when the immune system mistakenly attacks the body's own healthy cells, failing to differentiate between foreign invaders and normal body cells.

2. **Analyzing the Options:**
- The question provides several options, and we need to determine which one is classified as an autoimmune disease.

3. **Evaluating Each Option:**
- **Option 1: Vitiligo**
- Vitiligo is characterized by the loss of skin color in patches due to the destruction of melanin-producing cells. It is not classified as an autoimmune disease.
- **Option 2: Alzheimer's Disease**
- Alzheimer's disease involves the degeneration of brain cells leading to memory loss and cognitive decline. It is not considered an autoimmune disease.
- **Option 3: Rheumatoid Arthritis**
- Rheumatoid arthritis is an autoimmune disease where the immune system attacks the joints and surrounding tissues, causing inflammation and pain. This is the correct answer.
- **Option 4: Psoriasis**
- Psoriasis is a skin condition that leads to the rapid buildup of skin cells, resulting in itchy, dry patches. It is not classified as an autoimmune disease.

4. **Conclusion:**
- Based on the evaluations, the only autoimmune disease among the options provided is **Rheumatoid Arthritis**.

**Final Answer: Rheumatoid Arthritis is an autoimmune disease.**

---