Crossword Genius

"__ you serious?" (3)

Ross

I believe the answer is:

are

(Other definitions for are that I've seen before include "live" , "(We/you/they) exist" , "Unit of land measure equal to 100 square metres" , "(They/you/we) exist" , "Exist; square measure" .)

I've seen this clue in the LA Times, the USA Today, the Newsday, the Universal and The New York Times.
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