The correct option is A Thyroid
Thyroid is the only part of the body, that requires iodine. After having iodized salt, the iodine enters gastrointestinal tract. Then proteins transport the iodine to follicular cells within the thyroid gland. Inside the follicles, the iodine undergoes an oxidation process necessary for T3 (triiodothyronine) and T4 (thyroxine) hormone production.