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Which among the following is correctly categorized?

1. Troponin and Myosin \( \rightarrow \) Complex proteins in striated muscles
2. Calcitonin and Thymosin \( \rightarrow \) Thyroid hormones
3. Pepsin and Prolactin \( \rightarrow \) Digestive enzymes secreted in stomach
4. Secretin and Rhodopsin \( \rightarrow \) Polypeptide hormones

Correct answer: Troponin and Myosin \( \rightarrow \) Complex proteins in striated muscles

Solution

Troponin and myosin are both proteins associated with the contractile apparatus of striated muscle, so this pairing is correct. The other options mix up hormones, enzymes, and pigments with incorrect categories.

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