45587
Although nuclear chain reactions had been hypothesized in 1933 and the first artificial self-sustaining nuclear chain reaction ( Chicago Pile-1 ) had taken place in December 1942 , the Trinity test and the ensuing bombings of Hiroshima and Nagasaki that ended World War II represented the first large-scale use of nuclear technology and ushered in profound changes in sociopolitical thinking and the course of technology development .
 location: Chicago Pile-1
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: Chicago Pile-1 
Answer:
 location: Chicago Pile-1