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.

Example Input: 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
Example Output: sandstone

Example Input: Category: FULL "MOON"
Clue: Mercer & Mancini composed this 1961 classic
Example Output: "moon river"

Example Input: Category: OUR TROUBLED PLANET
Clue: Before building a highway, a state has to submit an EIS, this 2-word "statement", to get federal funding
Example Output:
environmental impact statement