QUES: Q: What does the YAG phosphor coating produce?
A: In this device a Y_3Al_5O_12:Ce (known as "YAG") phosphor coating on the emitter absorbs some of the blue emission and produces yellow light through fluorescence.
Does the answer answer the question?

ANS: yes

QUES: Q: When did Alexis Phifer and Kanye West get engaged?
A: West began dating reality star and longtime friend Kim Kardashian in April 2012.
Does the answer answer the question?

ANS: no

QUES: Q: In what year did Louis XIV die?
A: French historians traditionally place the Enlightenment between 1715, the year that Louis XIV died, and 1789, the beginning of the French Revolution.
Does the answer answer the question?

ANS: yes

QUES: Q: Which former contestant replaced Keith Urban for auditions in New York City?
A: Eighth season runner-up Adam Lambert filled in for Urban during the New York City auditions.
Does the answer answer the question?

ANS:
yes