Availability of iodized salt in the market virtually eliminated the disease, goitre. Give reason.

Explanation

**Step-by-Step Solution:**

1. **Understanding Goiter**: Goiter is a condition characterized by the enlargement of the thyroid gland. This enlargement is primarily caused by a deficiency of iodine in the diet.

2. **Role of Iodine**: Iodine is an essential nutrient that is required for the synthesis of thyroid hormones, namely thyroxine (T4) and triiodothyronine (T3). These hormones are crucial for regulating metabolism and overall growth and development.

3. **Effects of Iodine Deficiency**: When there is a lack of iodine in the body, the thyroid gland cannot produce sufficient amounts of T3 and T4 hormones. This deficiency leads to an increase in the secretion of thyroid-stimulating hormone (TSH) from the pituitary gland.

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