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.
--------
Question: Category: GO WITH THE FLOW 
Clue: The Tigris flows into this gulf

Answer: the persian gulf


Question: Category: WORLD HISTORY 
Clue: In a 1918 treaty, this country gave up Ukraine but soon recovered it

Answer: russia


Question: Category: THE AMERICAN REVOLUTION 
Clue: The promotion of Benjamin Lincoln & 4 others over him really irked this future traitor

Answer:
benedict arnold