An immune disease in which the body destroys the ill-functioning thyroid gland itself is

Options

A. Simmond's disease
B. myxoedema
C. Hashimoto's disease
D. cretinism

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for an autoimmune disease where the body attacks its own thyroid gland.

2. **Defining Autoimmune Diseases**: Autoimmune diseases occur when the immune system mistakenly targets and attacks the body's own tissues or organs.

3. **Identifying the Thyroid Gland**: The thyroid gland is an important endocrine gland that produces hormones regulating metabolism, growth, and development.

4. **Recognizing the Specific Disease**: The autoimmune disease that specifically targets and destroys the thyroid gland is known as Hashimoto's disease.

5. **Effects of Hashimoto's Disease**: In Hashimoto's disease, the immune system attacks the thyroid gland, leading to inflammation and a decrease in the production of thyroid hormones, which can result in hypothyroidism.

6. **Conclusion**: Therefore, the immune disease in which the body destroys the ill-functioning thyroid gland itself is Hashimoto's disease.

---