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In 1901 , Frederick Soddy and Ernest Rutherford discovered that radioactivity was part of the process by which atoms changed from one kind to another , involving the release of energy .
 person: Frederick Soddy; person: Ernest Rutherford
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: Frederick Soddy, Ernest Rutherford 
Answer:
 person: Frederick Soddy; person: Ernest Rutherford