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History The opening ceremony of Plekhanov House took place on 11 June 1929 , following the donation of the archives and library of Georgi Plekhanov by his widow , Rosalie Plekhanova , to the Soviet Union in 1925 .
 Plekhanov, Georgi Plekhanov, Soviet 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:
 Plekhanov, Georgi Plekhanov, Soviet Union