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TriOviz for Games Technology was showcased in June 2010 at Electronic Entertainment Expo 2010 by Mark Rein ( vice president of Epic Games ) as a 3D tech demo running on an Xbox 360 with Gears of War 2 .
 organization: Games; person: Mark Rein; organization: Epic Games
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: Games, Mark Rein, Epic Games 
Answer:
 organization: Games; person: Mark Rein; organization: Epic Games