3152
In the present study , ESB values are reported for 34 polycyclic aromatic hydrocarbon , 32 other organic contaminants , and seven metals ( cadmium , chromium , copper , nickel , lead , silver , zinc ) .
 Chemical: polycyclic aromatic hydrocarbon; Chemical: cadmium; Chemical: chromium; Chemical: copper; Chemical: nickel; Chemical: silver; Chemical: zinc
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: cadmium; Chemical: chromium; Chemical: copper; Chemical: nickel; Chemical: silver; Chemical: zinc