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Wofür stand der Ausdruck "Eiserner Vorhang"? Für die Abschottung …
What did the term 'Iron Curtain' stand for? For the isolation of ...
Explanation
The correct answer is "des Warschauer Pakts gegen den Westen" because it matches the German civic, legal, historical, or institutional fact asked in this question, specifically the topic of Begriff Eiserner Vorhang. The other options do not fit the question correctly.