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His volume of essays , " Bards and Tyrants : Essays in Contemporary African Writing " , evaluates some aspects and visions of African writing and criticism in the works of Achebe , Ngugi , Soyinka , Nwoga , Chinweizu , Emenyonu , Nnolim and other new poetry , prose and critical voices from around the continent .
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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:  
Answer:
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