Identify the unrelated component among the following options.
Keratin
Elastin
Dextrin
Collagen
Dextrin is a carbohydrate derived from starch, and it is not related to the structural proteins mentioned above. Dextrin is primarily used as a food additive or in certain industrial applications. On the other hand, Keratin, Elastin, and Collagen are all fibrous proteins that are related to the structural composition of various tissues in the body.
Hence, the correct answer is option 3.