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: ENDS IN "TH" 
Clue: This fish was thought to be extinct millions of years ago until one was found off South Africa in 1938

SOLUTION: coelacanth

PROBLEM: Category: BEFORE & AFTER 
Clue: "Boss" Tweed's politically corrupt society that had a No. 1 hit with "Kiss on my List"

SOLUTION: tammany hall & oates

PROBLEM: Category: GEOGRAPHY 
Clue: This river is responsible for irrigating about 6 million acres of land in Egypt

SOLUTION:
nile