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B
It regulates carbohydrates, protein and fat metabolism in the body
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C
Thyroid gland requires iodine to synthesize thyroxine
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D
Thyroxine is also called thyroid hormone
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Solution
The correct option is A Iron is essential for the synthesis of thyroxine Iodine is essential to synthesize thyroxine hormone; Iron has no role in it. Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland.