The correct answer is option 4: Melanin.

Pigments are substances that give color to tissues, organisms, or materials. They absorb certain wavelengths of light and reflect others, allowing us to perceive different colors. Melanin is a pigment primarily responsible for determining the color of our skin, hair, and eyes. It is produced by special cells called melanocytes found in the epidermal layer of the skin.

Option 1, Albumin, is a protein found in the blood plasma and does not have any color itself. It is involved in maintaining osmotic pressure and transporting various substances in the blood.

Option 2, Elastin, is a protein found in connective tissues, such as skin, blood vessels, and lungs. It provides elasticity and flexibility to these tissues but does not have a color.

Option 3, Keratin, is a protein found in hair, nails, and skin. It provides structure and protection but does not have a color.

Alert - correct answer should be 4: Melanin