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Wie viele Bundesländer kamen bei der Wiedervereinigung 1990 zur Bundesrepublik Deutschland hinzu?
How many federal states were added to the Federal Republic of Germany during reunification in 1990?
Explanation
The correct answer is "5" because it matches the German civic, legal, historical, or institutional fact asked in this question, specifically the topic of neue Bundeslaender. The other options do not fit the question correctly.