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By the beginning of the 1960 s , pop art was an experimental form that several artists were independently adopting ; some of these pioneers , such as Roy Lichtenstein , would later become synonymous with the movement .
 person: Roy Lichtenstein
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: Roy Lichtenstein 
Answer:
 person: Roy Lichtenstein