TASK DEFINITION: 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.
PROBLEM: Category: TO SERVE 
Clue: You can serve your leftovers directly from this brand of tight-sealing food containers introduced in 1945

SOLUTION: tupperware

PROBLEM: Category: THE WHITE HOUSE 
Clue: Among those who filled this post were Latisha Tyler Semple, Harriet Lane & Dolley Madison

SOLUTION: first lady

PROBLEM: Category: MUSEUMS 
Clue: This railroad's museum in Omaha has a tea set from Lincoln's private car & a replica of the Golden Spike

SOLUTION:
union pacific