27776
After NPs characterization , a battery of assays was performed to evaluate the viability , cytotoxicity , genotoxicity and oxidative damage in TiO2 NP - exposed SHSY5Y cells .
 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: TiO2