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They argued that drift is essentially a principal-agent problem that explores “ how — or indeed , whether — elected political officials can reasonably effectively assure that their policy intentions will be carried out .
 None
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:  
Answer:
 None