Coordination compounds have great importance in biological systems. In this context,which of the following statements is incorrect?
- ACyanocobalamin is $B_{12}$ and contains cobalt.
- BHaemoglobin is the red pigment of blood and contains iron.
- CChlorophylls are green pigments in plants and contain calcium.
- DCarboxypeptidase-$A$ is an enzyme and contains zinc.
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