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

• Correct answer
  A

  Chlorophylls are green pigments in plants and contains calcium
• B

  Carboxypeptidase $-\mathrm{A}$ is an enzyme and contains zinc
• C

  Cyanocobalamin is $\mathrm{B}_{12}$ and contains cobalt
• D

  Haemoglobin is the red pigment of blood and contains iron

Hence, the correct answer is option: 'A'.