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She started playing the piano at age nine , continuing her piano studies at the St. Petersburg Conservatory with Anton Gerke .
 organization: St. Petersburg Conservatory; person: Anton
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: St. Petersburg Conservatory, Anton 
Answer:
 organization: St. Petersburg Conservatory; person: Anton