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Quentin Smith states that " now " cannot be reduced to descriptions of dates and times , because all date and time descriptions , and therefore truth conditionals , are relative to certain events .
 Quentin Smith
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:
 Quentin Smith