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Nikolai Rubinstein offered him a professorship at the Moscow Conservatory but he refused , stating that his musical knowledge was basically empirical and that he did not have enough knowledge of music theory to take on such a position .
 person: Nikolai Rubinstein; organization: Moscow Conservatory
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Nikolai Rubinstein; organization: Moscow Conservatory