10216
The unique physical and chemical characteristics of titanium dioxide ( TiO2 ) nanoparticles result in different chemical and biological activities compared to their larger micron - sized counterparts , and can subsequently play an important role in influencing toxicity .
 Chemical: titanium dioxide; Chemical: TiO2
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: titanium dioxide; Chemical: TiO2