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History The Orpheum Circuit was started by the vaudeville impresario Gustav Walter who opened the Orpheum Opera House in San Francisco in 1886 .
 person: Gustav Walter
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: Gustav Walter 
Answer:
 person: Gustav Walter