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 consistency, answers should be in all lower cased letters.

Input: Consider Input: Category: TO SERVE 
Clue: You can serve your leftovers directly from this brand of tight-sealing food containers introduced in 1945

Output: tupperware


Input: Consider Input: Category: QUOTES 
Clue: 19th C. German chancellor who spoke of "Blut und Eisen", meaning "blood & iron"

Output: otto von bismarck


Input: Consider Input: Category: HOLIDAYS & OBSERVANCES 
Clue: A foundation in Nebraska City, Nebraska oversees & coordinates the activities of this tree-planting holiday


Output: arbor day