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However , at the end of the season , he returned to Catania after Milan opted not to exercise their buying option .
 organization: Catania; organization: Milan
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: Catania, Milan 
Answer:
 organization: Catania; organization: Milan