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: BELGIUM, BELARUS OR BELIZE 
Clue: It's part of the British Commonwealth of Nations
belize

Category: SONGS OF THE '60S 
Clue: Louis Armstrong's only No. 1 hit, it hit the charts for 19 weeks in 1964
"hello, dolly!"

Category: SCIENCE & NATURE 
Clue: The "fire" type of this insect builds large mounds that interfere with harvesting hay

fire ants