16338
The present study was designed to determine whether such an IL - 6 up - regulation also occurs in response to co - treatment by PAHs and tumor necrosis factor ( TNF ) - alpha , an inflammatory cytokine commonly found in tumor microenvironment .
 Chemical: PAHs
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: PAHs 
Answer:
 Chemical: PAHs