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Establishment The inauguration ceremony for the ministry establishment was held on 21 May 2012 , in which the ceremony was attended by President Ma Ying-jeou and Premier Sean Chen .
 person: Ma Ying-jeou; person: Sean Chen
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: Ma Ying-jeou, Sean Chen 
Answer:
 person: Ma Ying-jeou; person: Sean Chen