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 .
 Chemical: nickel oxide; Chemical: NiO
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: nickel oxide, NiO 
Answer:
 Chemical: nickel oxide; Chemical: NiO