TASK DEFINITION: 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.
PROBLEM: Category: BELGIUM, BELARUS OR BELIZE 
Clue: It's part of the British Commonwealth of Nations

SOLUTION: belize

PROBLEM: Category: SUCH GOOD CHEMISTRY 
Clue: A U.S. nuclear weapon using this element, Co, has been termed a doomsday device, as it would wipe out life on Earth

SOLUTION: cobalt

PROBLEM: Category: THE 19th FIRST ANNUAL IG NOBEL PRIZE 
Clue: A physics prize was awarded for analytically determining why women in this condition don't tip over

SOLUTION:
pregnancy