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At the age of " 13 , after the passing of his father and the destruction of his mother 's factory by fire , Mendeleev attended the Gymnasium in Tobolsk .
 Mendeleev, Gymnasium, Tobolsk
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mendeleev, Gymnasium, Tobolsk