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Haemoglobin is a complex of chlorophyll ...

Haemoglobin is a complex of_______ chlorophyll is a complex of_______ and vitamin `B_(12)` is a complex of_________ .

A

`Fe`, `Co`, `Mg`

B

`Co`, `Mg`, `Fe`

C

`Mg`, `Fe`, `Co`

D

`Fe`, `Mg`, `Co`

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