What is the pigment that absorbs ultraviolet light to tan the skin?

• A. Hemoglobin
• B. Keratin
• C. Carotene
• D. Melanin

Answer: (D)

Verified step by step guidance

1. Identify the function of each pigment listed in the options: Hemoglobin, Keratin, Carotene, and Melanin.
2. Understand that Hemoglobin is a protein in red blood cells responsible for transporting oxygen, not related to skin pigmentation.
3. Recognize that Keratin is a structural protein found in skin, hair, and nails, providing protection but not involved in pigmentation.
4. Note that Carotene is a pigment that can give skin a yellow-orange tint but does not absorb ultraviolet light.
5. Learn that Melanin is the pigment responsible for absorbing ultraviolet light, protecting the skin, and contributing to tanning.