Which term is used to protect the skin from sun damage by blocking radiation?

• A. Allergy
• B. Helmet
• C. Gum disease
• D. Sunscreen

Answer: (D)

Blocking ultraviolet radiation from the sun is the key idea in protecting skin from sun damage. Sunscreen does this by using active ingredients that absorb or reflect UV rays, creating a barrier on the skin; its SPF rating indicates protection against UVB, and broad-spectrum formulas guard against both UVA and UVB. To be effective, apply generously before sun exposure and reapply every two hours or after swimming or sweating. This choice fits best because the other terms relate to completely different health areas: allergy is an immune reaction, a helmet is for head protection from impact, and gum disease is a dental issue, none of which directly prevent sun-induced skin damage.