It is on the list of longest-running U.S. "line of work", with panelists being called on to question and identify a weekly celebrity "mystery guest" while blindfolded. The game uses celebrity panelists to question contestants in order to determine their occupation, i.e.
What's My Line? was a panel game show that originally ran in the United States on the CBS Television Network from 1950 to 1967, originally in black and white and later in color, with subsequent U.S.