Big Finish gained the license to classic Doctor Who several years after the series ended in 1989, and it began to produce audio dramas beginning circa 2000. While most were straightforward radio-style plays, some releases were more experimental.
"You Are the Doctor" is available on CD or as an archive of audio files; at the end of each track, listeners are instructed to skip to a different track, much like a standard choose-your-own adventure book. Black Mirror used a similar format in 2018 for Bandersnatch, but with (automated) video chapter skipping rather than audio tracks.
While "You Are the Doctor" is not particularly memorable—or, at least, I do not remember it in detail—it has high production values, with the original cast members (Sylvester McCoy and Sophie Aldred) playing their original roles.
It was written by John Dorney, one of the more popular writers at Big Finish. Comedy works well for short pieces, and Dorney made the sensible decision to bring back one of his alien races—a bumbling race of villainous pigs called Porcians—for this story.
Unfortunately "You Are the Doctor" only makes up one-quarter of the entire release and runs for about half an hour, meaning it is somewhat overpriced for those who are only interested in the story itself.
Another comparable release from Big Finish was 2003's "Flip Flop," a two-part story that allowed listeners to play either part first. See also "Attack of the Graske," an interactive movie for the revived series, originally broadcast on BBC's Red Button service in 2005.