3768
Twenty - three patients ( 38 % ) and 15 ( 26 % ) , in the combination and zidovudine groups , respectively , discontinued therapy ( p = 0 . 15 ) .
 Chemical: zidovudine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: zidovudine