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Tomas Bertelman , born 1945 , is a Swedish diplomat and up until recently ( 2012 ) was the Ambassador of Sweden to Russia , presenting his credentials to Russian President Dmitry Medvedev on 16 January 2009 .
 Tomas Bertelman, Swedish, Dmitry Medvedev
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tomas Bertelman, Swedish, Dmitry Medvedev