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The electron neutrino was discovered by Clyde Cowan and Frederick Reines in 1956 .
 person: Clyde Cowan; person: Frederick Reines
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: Clyde Cowan, Frederick Reines 
Answer:
 person: Clyde Cowan; person: Frederick Reines