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: This European grand duchy has 2 distinct land regions: the Ardennes & the Bon Pays
luxembourg

Category: HOLIDAYS 
Clue: "(Hi, I'm Chuck Woolery)  You can send a card to your sweetheart or anyone in your 4th grade class on this February holiday"
valentine\'s day

Category: PLAYS & PLAYWRIGHTS 
Clue: He collaborated on his hit comedy "Beggar On Horseback" with Marc Connelly, not Moss Hart

george s. kaufman