28286
Accordingly , a number of important toxicology issues are identified and integrated herein to provide a more comprehensive assessment of the health risks of different forms of pigment - grade and nanoscale titanium dioxide particles .
 Chemical: titanium dioxide
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: titanium dioxide 
Answer:
 Chemical: titanium dioxide