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.

Category: YOU'RE AN ANIMAL 
Clue: The plains variety of this animal has gray markings that are known as shadow stripes
a zebra

Category: INVENTORS & INVENTIONS 
Clue: Invented by Philip Drinker in the 1920s, this closed respirator is used by patients who can't breathe on their own
an iron lung

Category: OUR FLAG 
Clue: On August 3, 1949 Pres. Truman signed a resolution designating this date as Flag Day

june 14