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Commodity played a key role throughout Karl Marx 's work ; he considered it a cell-form of capitalism and a key starting point for an analysis of this politico-economic system .
 person: Karl Marx
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: Karl Marx 
Answer:
 person: Karl Marx