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In the BBC series Civilisation , art historian Kenneth Clark praised the monument as " the greatest piece of sculpture of the 19th Century , perhaps , indeed , the greatest since Michelangelo .
 organization: BBC; person: Kenneth Clark; person: Michelangelo
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: BBC; person: Kenneth Clark; person: Michelangelo