The state capital of Rhineland-Palatinate is called …

EDITORIAL LEARNING AID

Why is this answer correct?

Mainz is the state capital of Rhineland-Palatinate and the seat of the state parliament and state government. Kaiserslautern, Ludwigshafen and Koblenz are other large cities in the state, but not the capital.

Mainz: state parliament, government, cathedral and Rhine.

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