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In the present study , we examined oxidative stress and genotoxic effects of sub - chronic low - dose VOCs mixture ( formaldehyde , benzene , toluene and xylene ) .
 Chemical: formaldehyde; Chemical: benzene; Chemical: toluene; Chemical: xylene
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: formaldehyde; Chemical: benzene; Chemical: toluene; Chemical: xylene