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From 1995 until August 2002 , Nguyen served as an Assistant U.S. Attorney in the Central District of California .
 person: Nguyen
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: Nguyen 
Answer:
 person: Nguyen