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: STATE DEPARTMENT TRAVEL WARNINGS 
Clue: "Sept. 17, 2008, armed terrorists attacked a U.S. embassy in Sana'a" in this country, so "y" go?
[A]: yemen


[Q]: Category: WORLD CAPITALS 
Clue: Belize City, a port, was Belize's capital until a 1961 hurricane; then the capital moved to this inland city
[A]: belmopan


[Q]: Category: PSYCHOLOGY 
Clue: Known for his "box", he wrote "Walden Two", a 1948 fiction work about operant conditioning
[A]:
b.f. skinner