Which of these is a borough (Bezirk) of Berlin?

EDITORIAL LEARNING AID

Why is this answer correct?

Pankow is one of Berlin's twelve boroughs and lies in the north of the city. Altona is a borough of Hamburg, Prignitz a district in Brandenburg and Mecklenburgische Seenplatte a district in Mecklenburg-Western Pomerania.

Pankow, Mitte, Neukölln: boroughs of Berlin.

This translation and explanation are editorial learning aids. The official German wording and answer key govern the examination.