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They often carried the title of master builder or surveyor after serving a number of years as an apprentice ( such as Sir Christopher Wren ) .
 person: Christopher Wren
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: Christopher Wren 
Answer:
 person: Christopher Wren