Which pair of active ingredients indicates that a sunscreen is a PHYSICAL (mineral) sunscreen rather than a chemical one?
a.Octinoxate and octocrylene
b.Avobenzone and oxybenzone
c.Zinc oxide and titanium dioxide
d.Homosalate and octisalate
Explanation
Physical (mineral) sunscreens use zinc oxide and/or titanium dioxide to sit on the skin and reflect or scatter UV light. The other ingredients listed are organic UV filters that absorb UV energy and convert it to heat, defining chemical sunscreens.
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