14705
Finally , an analysis of WS - PM fractions determined the presence of 4 - 5 polycyclic aromatic hydrocarbons ( PAHs ) , and preliminary work suggests a potential role for these PAHs to alter macrophage functions .
 Chemical: polycyclic aromatic hydrocarbons; Chemical: PAHs; Chemical: PAHs
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: polycyclic aromatic hydrocarbons; Chemical: PAHs; Chemical: PAHs