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Fish and macroinvertebrate assemblages , fish biomarkers ( i . e . , polycyclic aromatic hydrocarbon [ PAH ] metabolite levels in white sucker [ Castostomus commersoni ] and common carp [ Cyprinus carpio ] bile and DNA damage ) , sediment chemistry , and water quality were assessed at five locations relative to the primary source of historical PAH contamination - upstream ( RM 9 . 2 ) , adjacent ( RM 6 . 5 ) , and downstream ( RMs 5 . 7 , 4 . 4 , and 2 . 7 ) .
 Chemical: polycyclic aromatic hydrocarbon; Chemical: PAH; Chemical: PAH
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 hydrocarbon; Chemical: PAH; Chemical: PAH