21713
UVA photoirradiation of benzo [ a ] pyrene metabolites : induction of cytotoxicity , reactive oxygen species , and lipid peroxidation .
 Chemical: benzo [ a ] pyrene; Chemical: oxygen
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: benzo [ a ] pyrene; Chemical: oxygen