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.

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

A: lion
****
Q: Category: WE'RE NO. 1 
Clue: Nicaragua was the first country to ratify this charter in 1945; the U.S. took another 3 weeks

A: u.n. charter
****
Q: Category: MESSAGE IN A BATTLE 
Clue: The Viet Cong launched a major offensive on this lunar festival in 1968; message to LBJ: Hell, no!

A:
tet
****