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.
--------
Question: Category: SIGNS & SYMBOLS 
Clue: Symbols of mystery, they're the mysterious doubles of the people who cast them

Answer: shadows


Question: Category: "DON'T" YOU KNOW THIS SONG? 
Clue: No doubt you know this "Tragic Kingdom" tune was No. 1 for 16 weeks on the airplay chart in 1996 & '97

Answer: "don\'t speak"


Question: Category: NATIVE AMERICAN TRIBES 
Clue: During World War II, some 400 members of this Southwest tribe served as "code talkers" in the U.S. Marine Corps

Answer:
navajo