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In the latter half of the 1800 s , several inventors worked towards creating a method for doing just that , including Charles Bourseul , Thomas Edison , Elisha Gray , and Alexander Graham Bell .
 person: Charles Bourseul; person: Thomas Edison; person: Elisha Gray; person: Alexander Graham Bell
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Charles Bourseul, Thomas Edison, Elisha Gray, Alexander Graham Bell 
Answer:
 person: Charles Bourseul; person: Thomas Edison; person: Elisha Gray; person: Alexander Graham Bell