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.

Ex Input:
Category: MR. BODY 
Clue: Fed by the hepatic portal veins, it weighs about a pound more in men than in women

Ex Output:
liver


Ex Input:
Category: WORLD HISTORY 
Clue: He completed vols. 2 & 3 of Karl Marx's "Das Kapital"

Ex Output:
friedrich engels


Ex Input:
Category: A CENTURY OF REIGN 
Clue: Germany's Wilhelm I

Ex Output:

the 19th century