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We used this task to compare brain activation associated with risky decision - making in smokers ( n = 18 ) and nonsmokers ( n = 25 ) , while they performed the BART during functional magnetic resonance imaging ( fMRI ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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