Which measure creates social security in Germany?

EDITORIAL LEARNING AID

Why is this answer correct?

Health insurance is part of social insurance and protects people in the event of illness; it therefore creates social security. Car, building and liability insurance are private property or liability insurances and do not serve social security.

Social security: health, long-term care, pension and unemployment insurance.

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