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.

[EX Q]: Category: AMERICAN EXPLORERS 
Clue: After being led there by a local, Hiram Bingham claimed he "discovered" this lost Incan city in Peru
[EX A]: machu picchu

[EX Q]: Category: SKIP TO MY "LU" 
Clue: It's the capital city of Zambia
[EX A]: lusaka

[EX Q]: Category: "V"ARIETY 
Clue: In the 1860's this industrial "commodore" lost the fight for control of the Erie Railroad
[EX A]:
cornelius vanderbilt