For how many years is the state parliament in Hamburg elected?

EDITORIAL LEARNING AID

Why is this answer correct?

The Bürgerschaft of the Free and Hanseatic City of Hamburg is elected for five years. Three, four or six years are not provided for in the Hamburg constitution.

Hamburg elects its Bürgerschaft every five years.

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