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Apomorphine was also used as a private treatment of heroin addiction , a purpose for which it was championed by the author William S. Burroughs .
 person: William S. Burroughs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: William S. Burroughs