22551
Defect Chemistry of Oxide Nanomaterials with High Surface Area : Ordered Mesoporous Thin Films of the Oxygen Storage Catalyst CeO2 - ZrO2 .
 Chemical: Oxide; 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: Oxide, Oxygen 
Answer:
 Chemical: Oxide; Chemical: Oxygen