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: TWAIN TRACTS 
Clue: A miner bets on his amphibian's leaping ability in "The Celebrated Jumping Frog of" this county

SOLUTION: calaveras county

PROBLEM: Category: SYNONYMS 
Clue: This book of the Bible is a synonym of departure

SOLUTION: exodus

PROBLEM: Category: BASEBALL '98 
Clue: Helped by fearful pitchers, Mark McGwire also led the major leagues with 162 of these

SOLUTION:
walks