31609
On September 11 , 1957 , a plutonium fire occurred at the Rocky Flats Plant , which resulted in the significant plutonium contamination of surrounding populated areas .
 location: Rocky Flats Plant
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: Rocky Flats Plant 
Answer:
 location: Rocky Flats Plant