Pick out the wrong combination.

  • A
    $Fe^{2+} \to \text{Haemoglobin}$
  • B
    $Mg^{2+} \to \text{Photosynthesis}$
  • C
    $Se^{2+} \to \text{Kreb Cycle}$
  • D
    $Co^{2+} \to \text{Vitamin } B_{12}$

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