17899
Previous laboratory based studies have shown that oil sands process - affected waters ( OSPWs ) containing high concentrations of naphthenic acids ( > 25 mg / l ) have adverse effects on the reproductive physiology of fish .
 Chemical: naphthenic acids
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: naphthenic acids