For how many years is the Landtag in Mecklenburg-Vorpommern elected?

EDITORIAL LEARNING AID

Why is this answer correct?

The Landtag of Mecklenburg-Vorpommern is elected for five years. Three, four or six years do not apply there.

MV: state elections every five years.

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