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In 1989 , Sommer hosted MTV 's Post-Modern MTV , a five-nights-per-week late-night show devoted to alternative music .
 person: Sommer; organization: MTV; organization: MTV
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: Sommer, MTV, MTV 
Answer:
 person: Sommer; organization: MTV; organization: MTV