What is the head of government in Schleswig-Holstein called?

EDITORIAL LEARNING AID

Why is this answer correct?

In Schleswig-Holstein the head of government is called Minister-President; this person is elected by the Landtag. First Minister, Prime Minister and Mayor are titles from other countries or for municipal offices.

The title is Minister-President – not Prime Minister.

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