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B
vitamins
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C
proteins
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D
iron
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Solution
The correct option is C proteins Hair, finger, nails, hoofs are all made of protein called as keratin.
Keratin is a fibrous structural proteins. It is the key structural material making up the outer layer of human skin. It is also the key structural component of hair and nails.
Keratin monomers assemble into bundles to form intermediate filaments, which are tough and insoluble and form strong unmineralized tissues.