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Among the goals of ethnology have been the reconstruction of human history , and the formulation of cultural invariants , such as the incest taboo and culture change , and the formulation of generalizations about " human nature " , a concept which has been criticized since the 19th century by various philosophers ( Hegel , Marx , structuralism , etc . ) .
 person: Hegel; person: 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: Hegel, Marx 
Answer:
 person: Hegel; person: Marx