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The difference in the percentage of patients with a 50 % reduction in their nausea was 12 . 6 % ( 95 % CI - 4 . 6 % to 29 . 8 % ) .
 nausea
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 nausea