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 Q]: Category: INVENTORS & INVENTION 
Clue: In April 2008, a man successfully completed a jump using a parachute designed by this man 523 years before
[EX A]: leonardo da vinci

[EX Q]: Category: HISTORIC ROYALTY 
Clue: These two men seen here, allies during World War I, were sometimes mistaken for each other
[EX A]: czar nicholas ii & king george v

[EX Q]: Category: ENTERTAINMENT HISTORY 
Clue: Originally known as the Missouri Rockets, they performed at the opening of an East Coast theatre in 1931
[EX A]:
the rockettes