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In 1915 , Sigmund Freud asked rhetorically , " Is n't what we mean by ' falling in love ' a kind of sickness and craziness , an illusion , a blindness to what the loved person is really like " .
 Sigmund Freud
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:
 Sigmund Freud