What colours does the state flag of Bremen have?

EDITORIAL LEARNING AID

Why is this answer correct?

The state flag of Bremen is striped red and white and shows the coat of arms with the key in the centre. Blue-white-red, green-white-red and black-gold are not Bremen state colours.

Bremen red-white, Hamburg white-red – both are Hanseatic.

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