You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: IN THE TEENS 
Clue: One of these "wheelers" is a large tractor-trailer truck rig
18-wheeler

Category: PRESIDENTS 
Clue: Though only 5'7", this founding father was called "The Colossus of Independence"
john adams

Category: 10-12 YEARS 
Clue: The Oracle at Delphi told this Greek hero he had to perform labors for King Eurystheus for 12 years

hercules