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Among the speakers was physicist Michio Kaku , who noted that one of the reactor pressure vessels had been installed backwards and called on California governor Jerry Brown ( then considered an environmentalist ) to shut them down .
 person: Michio Kaku; location: California; person: Jerry Brown
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Michio Kaku; location: California; person: Jerry Brown