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.

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

Output: friedrich engels


Input: Consider Input: Category: I NEED "HOPE" 
Clue: It weighs 45.52 carats

Output: the hope diamond


Input: Consider Input: Category: MOVIE ROLE IN COMMON 
Clue: Vanessa Redgrave & Keira Knightley: this queen


Output: guinevere