**Question:** All are true about Hypothyroidism except:

A. Hypothyroidism is a condition where the thyroid gland produces insufficient amount of thyroid hormones.
B. Hypothyroidism is a rare condition in children.
C. Hypothyroidism can lead to weight gain and fatigue.
D. Treatment for Hypothyroidism involves administration of thyroid hormone replacement therapy.

**Core Concept:**
Hypothyroidism is a thyroid disorder in which the thyroid gland does not produce enough thyroid hormones due to various causes such as autoimmune disease, surgery, radiation, medication, or iodine deficiency. These hormones play an essential role in regulating various biological processes in the body, including body temperature, heart rate, and basal energy expenditure.

**Why the Correct Answer is Right:**
The correct answer is **D.** Treatment for Hypothyroidism involves administration of thyroid hormone replacement therapy. This is because, despite B being true, it is not applicable to all cases of Hypothyroidism. Hypothyroidism can affect children and adults alike, making statement B incorrect for a general case of Hypothyroidism.

**Why Each Wrong Option is Incorrect:**
A is correct because Hypothyroidism is characterized by insufficient hormone production, which is a result of the primary issue with the thyroid gland.

B is incorrect because Hypothyroidism can affect children as well as adults. While it is a rare condition in children, it is still true for the general case of Hypothyroidism.

C is correct because Hypothyroidism typically leads to an increase in body temperature due to reduced basal energy expenditure. Fatigue is a consequence of the underlying cause of Hypothyroidism, not a direct feature of the condition itself.

**Why Statement D is Right:**
D is correct because the primary goal of treatment in Hypothyroidism is to replace the deficient hormones, which is achieved through administration of thyroid hormone replacement therapy. Statement D highlights that the treatment is focused on addressing the hormonal deficiency rather than the condition itself.

**Clinical Pearl:**
In cases of Hypothyroidism, it is essential to diagnose and treat the condition promptly, as it can lead to severe complications if left untreated. Treatment with thyroid hormone replacement therapy helps to restore the normal physiological functions and minimize the symptoms associated with the condition.