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Early conceptions of ecology , such as a balance and regulation in nature can be traced to Herodotus ( died " c " .
 person: Herodotus
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: Herodotus 
Answer:
 person: Herodotus