What colours does the state flag of Berlin have?

EDITORIAL LEARNING AID

Why is this answer correct?

The Berlin state flag is white and red and shows the Berlin bear in the centre. Blue-white-red is the flag of Schleswig-Holstein, green-white-red that of North Rhine-Westphalia and black-gold that of Baden-Württemberg.

White and red with a bear: Berlin.

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