Vitamin B₁₂ is a complex of:
a) cobalt
b) zinc
c) vanadium
d) nickel
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a) Cobalt Vitamin B12 is also called cobalamin and water-soluble vitamin that is involved with metabolism of every cell of the human body.
Vitamin B₁₂ is a complex of Cobalt and it is a cofactor in DNA synthesis.
B12 is the most chemically complex of all the vitamins and structure of B12 is based on a corrin ring.
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