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The Open Water Swimming competition at the 2009 World Aquatics Championships were held from July 21 to 25 at the beach of Ostia in Rome .
 location: Ostia
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: Ostia 
Answer:
 location: Ostia