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He added that , in the 19th century , an ideology which divided all of humanity into biologically different races - white , black , yellow , brown and red - as devised by Johann Friedrich Blumenbach served as a way of turning prejudices into a " universal truth " , apparently validated by science .
 Johann Friedrich Blumenbach
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:
 Johann Friedrich Blumenbach