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: A WALK ACROSS THE CHARLES BRIDGE 
Clue: Originally called Stone Bridge, the Charles Bridge was built with this "stone", like the walls of the White House
[EX A]: sandstone

[EX Q]: Category: "GRAND" PRIX 
Clue: This 3-word nickname for the Republicans dates from the 1870s
[EX A]: grand old party

[EX Q]: Category: BORN IN IRELAND 
Clue: Irish-born actor who played Britain's King Arthur in the movie version of "Camelot"
[EX A]:
richard harris