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It built in part on earlier work in the field by Bell researchers Harry Nyquist and Ralph Hartley , but it greatly extended these .
 person: Bell; person: Harry Nyquist; person: Ralph Hartley
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: Bell, Harry Nyquist, Ralph Hartley 
Answer:
 person: Bell; person: Harry Nyquist; person: Ralph Hartley