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In 1997 , he returned to France and took classes with Christian Boltanski at the École nationale supérieure des beaux-arts in Paris .
 Christian Boltanski, École nationale supérieure des beaux-arts
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Christian Boltanski, École nationale supérieure des beaux-arts