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Dmitry Gennadyevich Medvedev ( ; 1970 – 15 April 2005 ) was a Lieutenant-Colonel in the Federal Security Service of the Russian Federation who was killed in action in Chechnya .
 Dmitry Gennadyevich Medvedev, Federal Security Service, Russian Federation, Chechnya
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dmitry Gennadyevich Medvedev, Federal Security Service, Russian Federation, Chechnya