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Owners of the original Central Pacific Railroad were known as the Big Four .
 organization: Central Pacific Railroad; person: Big Four
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: Central Pacific Railroad, Big Four 
Answer:
 organization: Central Pacific Railroad; person: Big Four