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.

[EX Q]: Category: CROSSWORD CLUES "D _ _ _ ER" 
Clue: Macbeth thought he saw one
[EX A]: a dagger

[EX Q]: Category: A NOSE FOR GNUS 
Clue: A main predator of the adult gnu, it has a mane, too
[EX A]: lion

[EX Q]: Category: IT'S IN ARGENTINA 
Clue: Fossil tracks of Limayichnus major, a type of this, can be seen near El Chocon, Argentina
[EX A]:
a dinosaur