**Question:** All of the following are features of Grave's disease except:

A. Hyperthyroidism
B. Thyroid eye disease
C. Pale skin
D. Hypothyroidism

**Core Concept:** Grave's disease is a common autoimmune thyroid disorder characterized by hyperthyroidism (abnormal high levels of thyroid hormones), thyroid eye disease (inflammation of the tissues around the eye), and sometimes skin pallor due to poor circulation.

**Why the Correct Answer is Right:** Hypothyroidism is the opposite of Grave's disease, as it is caused by underactive thyroid gland (low thyroid hormone production) and not a result of the autoimmune response seen in Grave's disease.

**Why Each Wrong Option is Incorrect:**

**A. Hypothyroidism:** This is not a feature of Grave's disease because it is caused by an underactive thyroid gland and not the autoimmune response that results in hyperthyroidism in Grave's disease.

**B. Pale skin:** Pale skin is not a specific feature of Grave's disease and may occur due to various reasons unrelated to the disease itself.

**C. Hypothyroidism:** As explained above, hypothyroidism is the opposite of Grave's disease, and therefore not a feature of the condition.

**D. Thyroid-stimulating autoantibodies:** Grave's disease is an autoimmune disorder where the body produces thyroid-stimulating autoantibodies (antithyroid peroxidase or antithyroglobulin antibodies). These autoantibodies stimulate the thyroid gland, leading to hyperthyroidism (elevated thyroid hormone levels) and other features of the disease.

**Correct Answer:** Hypothyroidism (Option C) is incorrect because it is the opposite of Grave's disease (hyperthyroidism) and not a feature resulting from the disease process. The correct answer is **C. Hypothyroidism**.

**Why Each Wrong Option is Incorrect:**

1. Hypothyroidism (Option B) is incorrect because it is the opposite of Grave's disease (hyperthyroidism) and not a feature resulting from the disease process.
2. Thyroid-stimulating autoantibodies (Option D) are the underlying cause of Grave's disease, but they do not directly explain the presence of pale skin in the patient.
3. Pale skin (Option B) is not a specific feature of Grave's disease and can occur due to various reasons unrelated to the disease itself.

In conclusion, Grave's disease is an autoimmune disorder characterized by hyperthyroidism, thyroid-stimulating autoantibodies, and specific clinical features such as thyroid eye disease (thyroid eye disease) and autonomic nervous system overactivity. Hypothyroidism, thyroid-stimulating autoantibodies, and pale skin are not specific features of Grave's disease and are not relevant to the correct answer (hypothyroidism).