6252
Trout were exposed to either control ( without TiO ( 2 ) ) , 1 mg l ( - 1 ) TiO ( 2 ) NPs or 1 mg l ( - 1 ) bulk TiO ( 2 ) for 14 days .
 Chemical: TiO ( 2 ); Chemical: TiO ( 2 ); Chemical: TiO ( 2 )
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: TiO ( 2 ), TiO ( 2 ), TiO ( 2 ) 
Answer:
 Chemical: TiO ( 2 ); Chemical: TiO ( 2 ); Chemical: TiO ( 2 )