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A phủ ( chữ Hán : 府 ) or prefecture was an administrative unit in 15-19th Century Vietnam similar to the Chinese use of the same Chinese character fu ( wikt : 府 ) for the zhou county subdivision in China .
 location: Vietnam
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: Vietnam 
Answer:
 location: Vietnam