Iodine is necessary for the synthesis of which hormone in the human body ?
Thyroxine
The thyroid gland in the neck takes up iodine from the blood and uses it to make the thyroid hormones. Thyroxine (T4) carries four iodine atoms per molecule, and it regulates the basal metabolic rate, growth and development.
A diet lacking iodine leads to low thyroxine and enlargement of the thyroid gland (goitre); in children it can cause cretinism. This is why iodised salt is promoted in India.
Auxin is a plant growth hormone, not a human hormone. Insulin is made by the beta cells of the pancreas and adrenaline by the adrenal medulla; neither contains iodine or needs it for synthesis.
Thyroxine option is correct.
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