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Reviewing the work for The Guardian , art critic Robert Hughes , considered the work to be that of " the best sculptor alive ... " going on to add that Serra was also " the only great one at work anywhere in the early 21st century . " .
 organization: The Guardian; person: Robert Hughes; person: Serra
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: The Guardian, Robert Hughes, Serra 
Answer:
 organization: The Guardian; person: Robert Hughes; person: Serra