The state capital of Lower Saxony is called …

EDITORIAL LEARNING AID

Why is this answer correct?

Hanover is the state capital of Lower Saxony; the state parliament and the state government have their seat there. Brunswick, Wolfsburg and Osnabrück are large cities in the state, but they are not the capital.

Hanover: state parliament, government, trade fair.

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