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The idea that nanoflares might heat the corona was proposed by Eugene Parker in the 1980 s but is still controversial .
 person: Eugene Parker
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: Eugene Parker 
Answer:
 person: Eugene Parker