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His father was related to the former Chief Justice of Bengal , Sir Robert Chambers , and the family were originally from Northumberland before settling in London .
 person: Sir Robert Chambers
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: Sir Robert Chambers 
Answer:
 person: Sir Robert Chambers