If perspiration wets the skin, and when it evaporates, it cools the body, then what wets the skin, and when it evaporates, it cools the body?

Answer choices:
- heat energy
 - acetic acid
 - Air conditioner
 - salt and water.
 - Skin oil
 - water vapor
 - Perspiration
 - A towel

 

       Perspiration   