instruction:
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.
question:
Category: DUMB GUYS' GREATEST INVENTIONS 
Clue: Dumb guys think it's cool they get to slide their own credit card at the store; even cooler? This word for "slide"
answer:
swipe


question:
Category: THE BIG APPLE 
Clue: On the NYC subway this train will also take you to Harlem, but then it splits off & heads for Yankee Stadium
answer:
the b train


question:
Category: 20th CENTURY USA 
Clue: During the 1930s, Dorothea Lange & Margaret Bourke-White established themselves in this profession
answer:

photography