20912
The generation of reactive oxygen species ( ROS ) upon H2O2 and CSA treatment was lower than that of H2O2 alone .
 Chemical: oxygen; Chemical: H2O2; Chemical: CSA; Chemical: H2O2
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: oxygen; Chemical: H2O2; Chemical: CSA; Chemical: H2O2