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 consistency, answers should be in all lower cased letters.

Category: BRAZIL 
Clue: It got its name after a Spanish explorer reported being attacked by female warriors there
amazon river

Category: BUSINESS & INDUSTRY 
Clue: This stagecoach company owned the Pony Express during the last few months of its existence
wells fargo

Category: RIDE WITHOUT A LICENSE 
Clue: In 2008 this sport, run on a bumpy dirt track, will be added to the Summer Olympics to help attract younger viewers

bmx