Fact 1: Urine leaves the body through a sphincter in the process of urination.

Fact 2: Urination requires relaxation of the sphincter muscle.

Given the two facts above, answer the question "What leaves the body upon relaxation of a muscle?" with the following options: 
- sweat
 - urine
 - Energy.
 - Energy
 - fat
 - lead
 - blood
 - gasoline


 

  urine       