10218
While all types of tested TiO2 samples decrease cell viability in a mass - based concentration - and size - dependent manner , the polyacrylate - coated nano - TiO2 product was only cytotoxic at higher concentrations .
 Chemical: TiO2; Chemical: polyacrylate; 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; Chemical: polyacrylate; Chemical: TiO2