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The most obvious one with the greatest effect on the corporation was at Impala where we had the furnace failure , " Gilbertson said .
 organization: Impala; person: Gilbertson
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, else, organization, person 
Text: {0} 
 Entities: Impala, Gilbertson 
Answer:
 organization: Impala; person: Gilbertson