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Wie wird der Beitritt der DDR zur Bundesrepublik Deutschland im Jahr 1990 allgemein genannt?
What is the general name for the accession of the DDR to the Federal Republic of Germany in 1990?
Explanation
The correct answer is "Deutsche Wiedervereinigung" because it matches the German civic, legal, historical, or institutional fact asked in this question, specifically the topic of DDR-BRD-Beitritt. The other options do not fit the question correctly.