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.

Category: CUBA 
Clue: In the news in 1961, this bay in the Cuban province of Las Villas is also called Bahia de los Cochinos
bay of pigs

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

Category: CATHOLICISM 
Clue: Ideas in his "Summa Theologica" formed the basis of many Roman Catholic doctrines

saint thomas aquinas