Cobalt is a component of _____, sulfur is a component of _____, and iodine is a component of _____
A) tocopherol, cysteine, insulin
B) choline, homocysteine, opsin
C) vitamin B12, methionine, thyroxine
D) biotin, pyridoxamine, folacin
E) tryptophan, niacin, salt
C
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