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The scientific reputation of eugenics started to decline in the 1930 s , a time when Ernst Rüdin used eugenics as a justification for the racial policies of Nazi Germany .
 Ernst Rüdin, Nazi Germany
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ernst Rüdin, Nazi Germany