Question

keratin is a protein that makes
sweat
sebum
hair and nail
dermis of skin

Explanation:

Keratin is a fibrous structural protein. It is a key component in the formation of hair, nails, and the outer layer of human skin. Sweat is a fluid secreted by sweat glands, mainly consisting of water, salts, and some metabolites. Sebum is an oily secretion of the sebaceous glands. The dermis of the skin contains connective tissues, blood vessels, etc., and keratin is not the main substance that makes up sweat, sebum, or the dermis.

Answer:

hair and nail