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In 1979 , Daniel Friedan showed that the equations of motions of string theory , which are generalizations of the Einstein equations of general relativity , emerge from the renormalization group equations for the two-dimensional field theory .
 person: Daniel Friedan; person: Einstein
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: Daniel Friedan, Einstein 
Answer:
 person: Daniel Friedan; person: Einstein