"___ knows?" (3)

I think it could be either:

who

god

(Other definitions for who that I've seen before include "Question of identity" , "Fictional doctor" , "Universal health body" , "Which person?" , "medical experts" .)

I've seen this clue in The Washington Post and the New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.