Coordination compounds have great importance in biological systems. In this context,which of the following statements is incorrect?

  • A
    Carboxypeptidase-$A$ is an enzyme and contains zinc.
  • B
    Haemoglobin is the red pigment of blood and contains iron.
  • C
    Cyanocobalamin is Vitamin $B_{12}$ and contains cobalt.
  • D
    Chlorophylls are green pigments in plants and contain calcium.

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