Select the incorrect statement regarding hemoglobin.

  • A
    One hemoglobin molecule carries four $O_2$ molecules.
  • B
    It is a red-colored iron-containing pigment.
  • C
    $O_2$ binds with hemoglobin in an irreversible manner.
  • D
    The binding of $O_2$ with hemoglobin is primarily related to partial pressure.

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