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.

[Q]: Category: WORLD HISTORY 
Clue: He completed vols. 2 & 3 of Karl Marx's "Das Kapital"
[A]: friedrich engels


[Q]: Category: IN THE TEENS 
Clue: One of these "wheelers" is a large tractor-trailer truck rig
[A]: 18-wheeler


[Q]: Category: X, Y, Z 
Clue: This Michigan city was settled in 1825 and named for a nineteenth-century Greek patriot
[A]:
ypsilanti