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Art historian Robert Rosenblum was asked in 1977 to identify the " most overrated and underrated " artists of the 20th century .
 Robert Rosenblum
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Robert Rosenblum