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The aim of the present study is to determine the levels of PCAHs in samples of meat , fish , chicken , fried potato , and toasted bread , which will be thermally processed using conventional and microwave ovens .
 PCAHs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 PCAHs