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Which of the following hormones contains iodine as part of its structure?

1. Thyroxine is classified as an amino-based hormone.
2. Vitamin B dissolves in water, while the rest are fat-soluble.
3. Biotin, also referred to as Vitamin H, belongs to the B-complex group.
4. Testosterone and adrenaline are examples of steroid hormones.

Correct answer: Thyroxine is classified as an amino-based hormone.

Solution

Thyroxine is an amino hormone derived from the amino acid tyrosine and contains iodine, which is unique among the given options.

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