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: WORLD EVENTS 
Clue: In 2003, 120 years after it made headlines, a book on this was subtitled "The Day the World Exploded"

Ex Output:
the eruption of krakatoa


Ex Input:
Category: WORLD RIVERS 
Clue: With 4, more national capitals are located on this river than any other river in the world

Ex Output:
the danube


Ex Input:
Category: VICE PRESIDENTS 
Clue: At 39 he was the youngest man to take the office of vice president

Ex Output:

richard nixon