If salt and water wet the skin, and when it evaporates, it cools the body, then what wets the skin, and when it evaporates, cools the body?

Answer choices:
- acetic acid
 - salt and water
 - Chlorophyll
 - peachleaf willow
 - reducing acid rain
 - Heat energy
 - heat or cold
 - hydration

 

  salt and water        