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.

Category: WORLD GEOGRAPHY 
Clue: The Lusatian Mountains, in the western Sudeten range, form part of the border between these 2 countries
germany & the czech republic

Category: PLAYS 
Clue: Written in 1953 & set in the late 17th C., this play takes place about 16 miles northeast of where we are right now
the crucible

Category: WORDS & PHRASES 
Clue: Once slang for brain, this 2-word phrase now means the Heritage Foundation or the Brookings Institution

a think tank