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: SPORTS FIRSTS ON THE FIRST 
Clue: On February 1, 1970 Dave Balon pulled off his first one of these in his pro hockey career

SOLUTION: hat trick

PROBLEM: Category: BASEBALL 
Clue: Say hey! This Giants centerfielder appeared in a record-tying 24 All-Star games

SOLUTION: willie mays

PROBLEM: Category: POLAND 
Clue: Of 1 out of 5, 1 out of 15, or 1 out of 50, approximate ratio of Polish families who own cars

SOLUTION:
1 out of 50