Select the disease which is NOT an auto - immune disorder .

Options

A. Myasthenia gravis
B. Rheumatoid arthritis
C. Muscular dystrophy
D. Grave's disease

Answer

To solve the question "Select the disease which is NOT an auto-immune disorder," we will analyze each of the provided options one by one.

### Step-by-Step Solution:

1. **Identify the diseases listed in the options:**
- Myasthenia Gravis
- Rheumatoid Arthritis
- Muscular Dystrophy
- Graves' Disease

2. **Analyze Myasthenia Gravis:**
- Myasthenia Gravis is a neuromuscular disorder characterized by weakness in the skeletal muscles.
- It is caused by the immune system producing antibodies that block or destroy acetylcholine receptors at the neuromuscular junction.
- **Conclusion:** Myasthenia Gravis is an autoimmune disorder.

3. **Analyze Rheumatoid Arthritis:**
- Rheumatoid Arthritis is an inflammatory disorder that primarily affects the joints.
- It is caused by the immune system attacking the synovium (the lining of the membranes that surround the joints).
- **Conclusion:** Rheumatoid Arthritis is also an autoimmune disorder.

4. **Analyze Muscular Dystrophy:**
- Muscular Dystrophy is a group of genetic disorders characterized by progressive muscle weakness and degeneration.
- It is primarily caused by genetic mutations and is inherited rather than being caused by the immune system attacking the body.
- **Conclusion:** Muscular Dystrophy is NOT an autoimmune disorder.

5. **Analyze Graves' Disease:**
- Graves' Disease is an autoimmune disorder that affects the thyroid gland, leading to hyperthyroidism.
- In this condition, the immune system produces antibodies that stimulate the thyroid gland to produce excess thyroid hormones.
- **Conclusion:** Graves' Disease is an autoimmune disorder.

6. **Final Conclusion:**
- Out of the options provided, the disease that is NOT an autoimmune disorder is **Muscular Dystrophy**.

### Answer:
**Muscular Dystrophy** is the disease which is NOT an autoimmune disorder.

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