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In 1899 , Ernest Rutherford separated radioactive emissions into two types : alpha and beta ( now beta minus ) , based on penetration of objects and ability to cause ionization .
 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: Ernest Rutherford 
Answer:
 person: Ernest Rutherford