3508
However , any improvement produced by drug treatment was largely a result of a beneficial effect exerted by its vehicle ( polyethylene glycol and NaOH ) .
 Chemical: polyethylene glycol; Chemical: NaOH
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: polyethylene glycol; Chemical: NaOH