(a) Adrenaline
(b) Thyroxin
(c) Auxin
(d) Insulin


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(b) Thyroxin

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Correct option (B) Thyroxin

Explanation:

Thyroxine is an iodinated amino acid, so its synthesis requires iodine.

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Iodine is required for the synthesis of thyroxine hormone. All other hormones are not required iodine for their synthesis.

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