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

SOLUTION: willie mays

PROBLEM: Category: OH "BOY" 
Clue: Slang term for an American infantryman of WWI

SOLUTION: doughboy

PROBLEM: Category: BIOLOGY 
Clue: Fibrogen is a protein material that helps the blood in doing this

SOLUTION:
clotting