12183
CONCLUSIONS : The role played by IL - 10 in benzene immune suppression may be relevant and attention should be directed toward assessment of age , working years , and employment age in benzene - exposed populations .
 Chemical: benzene; Chemical: benzene
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: benzene; Chemical: benzene