27448
PVO nanoparticles exhibit potent antioxidant activities by scavenging H2O2 and inhibiting the generation of ROS ( reactive oxygen species ) and also reduce the expression of pro - inflammatory cytokines in activated macrophages in vitro and in vivo .
 Chemical: PVO; Chemical: H2O2; Chemical: oxygen
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: PVO, H2O2, oxygen 
Answer:
 Chemical: PVO; Chemical: H2O2; Chemical: oxygen