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Carsten Keller ( born on 8 September 1939 ) is a former field hockey player from West - Germany , who won a gold medal for his native country at the 1972 Summer Olympics in Munich .
 Carsten Keller, Germany, Munich
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Carsten Keller, Germany, Munich