Which of the following is an autoimmune disease

Options

A. Asthama
B. Rheumatoid arthritis
C. Hey fever
D. Erythro blastosis foetalis

Answer

### Step-by-Step Solution:

1. **Understanding Autoimmune Diseases**:
- Autoimmune diseases occur when the immune system mistakenly attacks the body's own tissues. This can lead to inflammation and damage to various organs and systems.

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

3. **Evaluating Each Option**:
- **Option 1: Allergic Disease**: Allergic diseases are caused by an overreaction of the immune system to harmless substances, not by the immune system attacking the body itself. Therefore, this is not an autoimmune disease.
- **Option 2: Rheumatoid Arthritis**: This is a well-known autoimmune disease where the immune system attacks the synovial membrane in the joints, leading to inflammation and pain. This is the correct answer.
- **Option 3: Hay Fever**: Hay fever is an allergic reaction to pollen and does not involve the immune system attacking the body's own tissues. Thus, it is not classified as an autoimmune disease.

4. **Conclusion**:
- After evaluating all the options, the only autoimmune disease listed is **Rheumatoid Arthritis**.

### Final Answer:
The autoimmune disease among the options is **Rheumatoid Arthritis**.

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