10797
A new strategy for intracellular delivery of enzyme using mesoporous silica nanoparticles : superoxide dismutase .
 Chemical: silica; Chemical: superoxide
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: silica, superoxide 
Answer:
 Chemical: silica; Chemical: superoxide