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: SONGS OF THE '60S 
Clue: Louis Armstrong's only No. 1 hit, it hit the charts for 19 weeks in 1964

SOLUTION: "hello, dolly!"

PROBLEM: Category: 1901-1910 
Clue: In 1909 Henry Ford produced over 10,000 of this car, saying customers could get it in "any color...so long as it is black"

SOLUTION: the model t

PROBLEM: Category: POP SONGS BY THE NUMBERS 
Clue: According to the title of a Spice Girls ballad, when this happens, "It's the only way to be"

SOLUTION:
"when two becomes one"