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 simplicity, answers should be in all lower cased letters.
PROBLEM: Category: ARE YOU A BETTING MAN? 
Clue: C'mon, one more cherry!  Bally's Las Vegas became the first hotel with a $1,000 one of these

SOLUTION: a slot machine

PROBLEM: Category: RIVERS 
Clue: In 1951 it was determined that this river's source was in the Sierra Parima of Venezuela

SOLUTION: the orinoco

PROBLEM: Category: CARIBBEAN CUISINE 
Clue: La Habichuela in Cancun features cocobichuela: lobster & shrimp served in one of these shells

SOLUTION:
coconut shell