Fact 1: Sight is the ability to sense light, and the eye is the organ that senses light.

Fact 2: Once the brain interprets the messages, the sight process is completed.

Given the two facts above, answer the question "Sensing what requires the brain?" with the following options: 
- poltergeist
 - light
 - demons
 - state
 - voltage
 - nerves
 - motion
 - ghosts


 

  light       