"Do I know that person?” (3)

I believe the answer is:

who

(Other definitions for who that I've seen before include "international medical group" , "The - - , rock legends" , "Time-travelling Doctor" , "Doctor --, TV series" , "Which person?" .)

I've seen this clue in The Wall Street Journal and the Universal.

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.