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: FULL "MOON"
Clue: Mercer & Mancini composed this 1961 classic

SOLUTION: "moon river"

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: RAKES & LIVERS
Clue: The portal vein & this artery supply blood to the liver

SOLUTION:
the hepatic artery