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Adolf Bieringer ( 1928 – 1988 ) was a German politician , representative of the German Christian Democratic Union .
 Adolf Bieringer, German, German Christian Democratic Union
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Adolf Bieringer, German, German Christian Democratic Union