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He studied with Robert Casadesus , Egon Petri , Roger Sessions , and Nadia Boulanger .
 person: Robert Casadesus; person: Egon Petri; person: Roger Sessions; person: Nadia Boulanger
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: Robert Casadesus, Egon Petri, Roger Sessions, Nadia Boulanger 
Answer:
 person: Robert Casadesus; person: Egon Petri; person: Roger Sessions; person: Nadia Boulanger