(B) Vitamin $B_{12}$,also known as cyanocobalamin,is a complex organic compound that contains a central cobalt $(Co)$ metal ion coordinated within a c

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(B) Vitamin $B_{12}$,also known as cyanocobalamin,is a complex organic compound that contains a central cobalt $(Co)$ metal ion coordinated within a corrin ring system. Its chemical formula is $C_{63}H_{88}O_{14}N_{14}PCo$. Therefore,it is the only vitamin among the options that contains a metal atom.