5227
When the mice were exposed to OVA and to high and intermediate doses of iron oxide submicron - or nanoparticles , the OVA - induced allergic response was significantly inhibited , as evidenced by the decrease in eosinophil cell influx and specific IgE levels .
 Chemical: iron oxide
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: iron oxide 
Answer:
 Chemical: iron oxide