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In a 1966 scenario known as " The sheep in the field " , Roderick Chisholm asks us to imagine that someone is standing outside a field looking at something that looks like a sheep ( although in fact , it is a dog disguised as a sheep ) .
 Roderick Chisholm
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:
 Roderick Chisholm