11064
In our study , male Wister rats were exposed to nickel oxide ( NiO ) particles including a nano - scale , even for aerosols and suspensions , in a 4 - week inhalation and intratracheal instillation .
 nickel oxide, NiO
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 nickel oxide, NiO