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The foundations of electrical engineering in the 1800 s included the experiments of Alessandro Volta , Michael Faraday , Georg Ohm and others and the invention of the electric telegraph in 1816 and the electric motor in 1872 .
 person: Alessandro Volta; person: Michael Faraday; person: Georg Ohm
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: Alessandro Volta, Michael Faraday, Georg Ohm 
Answer:
 person: Alessandro Volta; person: Michael Faraday; person: Georg Ohm