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Directed by Robert Taylor ( but credited to William Hanna and Joseph Barbera on the final print ) , with storyboards by Pete Alvarado .
 person: Robert Taylor; person: William Hanna; person: Joseph Barbera; person: Pete Alvarado
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 Taylor, William Hanna, Joseph Barbera, Pete Alvarado 
Answer:
 person: Robert Taylor; person: William Hanna; person: Joseph Barbera; person: Pete Alvarado