Question: Two of London's 33 districts are cities: the City of London (the historic centre including Smithfield and Holborn) and which other?
Sentence (from "City of London"): Administratively, it forms one of the 33 local authority districts of Greater London; however, the City of London is not a London borough, a status reserved for the other 32 districts (including London's only other city, the City of Westminster).
Relevant evidence: Yes