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.

Category: FOOD SCIENCE 
Clue: In 2002 Japanese scientists discovered it contains the enzyme Lachrymatory-Factor Synthase
onions

Category: STATE FACTS 
Clue: In August 1959 a coin toss helped Hiram L. Fong become this state's senior senator
hawaii

Category: 19th CENTURY BOOKS 
Clue: "Political power... is merely the organized power of one class for oppressing another" is from this work

the communist manifesto