Correct Answer: Iodine

Solution : The correct answer is Iodine .

The mineral responsible for the synthesis of the thyroxine hormone is iodine. It is an essential component in the structure of thyroid hormones, including thyroxine. Thyroxine plays a crucial role in regulating metabolism and maintaining overall physiological balance in the body. Adequate iodine intake is necessary for the proper functioning of the thyroid gland and the synthesis of these vital hormones.