3526
Otto Ostrowski ( born 28 January 1883 in Spremberg ; died 16 June 1963 in Knokke , Belgium ) was a German politician of the Social Democratic Party of Germany ( SPD ) and Mayor of Berlin in 1946 – 1947 .
 Otto Ostrowski, Spremberg, Knokke, Belgium, Social Democratic Party of Germany, Berlin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Otto Ostrowski, Spremberg, Knokke, Belgium, Social Democratic Party of Germany, Berlin