Fact 1: Microorganisms can cause infections.

Fact 2: Chlorination uses liquid chlorine bleach to kill microorganisms.

Given the two facts above, answer the question "Which chemical added to water prevents illnesses? " with the following options: 
- Glucose
 - evaporation
 - Chlorine.
 - sugar
 - Allergies
 - sweating
 - energy
 - hydration


 

   Chlorine.      