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Antonios Gkioulmpas ( also Antonios Gioulbas , ; born April 17 , 1986 in Marousi ) is a retired Greek swimmer , who specialized in backstroke events .
 location: Marousi
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: Marousi 
Answer:
 location: Marousi