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: THE COUNTRY WHERE YOU'D FIND 
Clue: ...the longest bridge over water in the world
the united states

Category: WORLD LEADERS 
Clue: After overthrowing Milton Obote in 1971, he had some 300,000 people killed
idi amin

Category: ON THE RADIO 
Clue: "Sober" was a 2009 hit for this woman whose hair color no longer matches her name

pink