Which is an auto immune disease?

Options

A. cancer
B. asthama
C. erythroblastosis fetalis
D. rheumatoid arthritis

Answer

To determine which is an autoimmune disease, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Autoimmune Diseases**: Autoimmune diseases occur when the immune system mistakenly attacks the body's own healthy cells. This can lead to various health issues depending on which part of the body is affected.

2. **Identify Examples of Autoimmune Diseases**: Common examples include:
- Rheumatoid Arthritis
- Systemic Lupus Erythematosus (SLE)
- Type 1 Diabetes
- Multiple Sclerosis
- Hashimoto's Thyroiditis

3. **Differentiate from Other Conditions**: It is important to differentiate autoimmune diseases from other conditions. For instance, asthma is not an autoimmune disease; it is primarily an allergic reaction.

4. **Select an Autoimmune Disease**: From the examples provided, we can conclude that Rheumatoid Arthritis is an autoimmune disease, as it involves the immune system attacking the joints.

5. **Conclusion**: Therefore, among the options, Rheumatoid Arthritis is classified as an autoimmune disease.