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Concentrations of polycyclic aromatic hydrocarbons ( PAHs ) and metals in the bivalves and PAH metabolites in fish bile were quantified .
 Chemical: polycyclic aromatic hydrocarbons; Chemical: PAHs; Chemical: PAH
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: polycyclic aromatic hydrocarbons, PAHs, PAH 
Answer:
 Chemical: polycyclic aromatic hydrocarbons; Chemical: PAHs; Chemical: PAH