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

  • A
    Calcitonin and thymosin $\rightarrow$ Thyroid hormones
  • B
    Pepsin and prolactin $\rightarrow$ Two digestive enzymes secreted in stomach
  • C
    Troponin and myosin $\rightarrow$ Complex proteins in striated muscles
  • D
    Secretin and rhodopsin $\rightarrow$ Polypeptide hormones

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