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The scientific study of relationships evolved during the 1990 s and came to be referred to as " relationship science " , after research done by Ellen Berscheid and Elaine Hatfield .
 person: Ellen Berscheid; person: Elaine Hatfield
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: Ellen Berscheid, Elaine Hatfield 
Answer:
 person: Ellen Berscheid; person: Elaine Hatfield