Who's Dr. Who?
Since the anon is confused, here’s screencaps from the show to answer their question:
— “Dr. Who” in closing credits for original episode, Unearthly Child
— “Dr. Who” in closing credits for Tomb of the Cybermen
— “Dr. Who” in original pitch for the show by its creator, Sydney Newman
— ”Dr. Who” in Radio Times listing for the very first episode. Radio Times magazine was owned by the BBC, and reported on its programming.( Tons more examples of 'Dr. Who' in the show... )