What colours does the state flag of Saxony-Anhalt have?

EDITORIAL LEARNING AID

Why is this answer correct?

The state flag of Saxony-Anhalt has yellow and black stripes, with yellow on top. Blue-white-red is the flag of Schleswig-Holstein, white-red that of Thuringia, and green-white-red are the colours of North Rhine-Westphalia.

Yellow on top, black below: the flag of Saxony-Anhalt.

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