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: SPACE MISSIONS 
Clue: The New Horizons mission was launched to explore this planet before it was downgraded to a dwarf
pluto

Category: FOREIGN NATIONAL PARKS 
Clue: Great Gobi Desert
mongolia

Category: ANNUALLY OBSERVED 
Clue: A Hallmark card for these professionals' day, near Mother's Day, refers to their "patient, giving ways"

nurses