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Which one of the following pairs of chemical substances is correctly categorized?

1. Calcitonin and thyroxin - Thyroid hormones
2. Pepsin and prolactin - Two digestive enzymes secreted in stomach
3. Troponin and myosin - Complex proteins in striated muscles
4. Secretin and rhodopsin - Polypeptide hormones

Correct answer: Calcitonin and thyroxin - Thyroid hormones

Solution

Calcitonin and thyroxin are both hormones produced by the thyroid gland.

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