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 simplicity, answers should be in all lower cased letters.
PROBLEM: Category: ON THE GO 
Clue: John Ericsson, who built a steam locomotive in England in 1829, built this famous Civil War steam-powered ship

SOLUTION: the monitor

PROBLEM: Category: OSCAR-WINNING SONGS 
Clue: "Chim Chim Cher-ee"

SOLUTION: mary poppins

PROBLEM: Category: FAMOUS AMERICANS 
Clue: In 1805 this explorer was sent to take a "peak" at the upper Mississippi

SOLUTION:
pike