3447
At the end of the 14 - d exposure adult zebrafish were able to reproduce ; however , the cumulative number of viable embryos produced was lower in fish exposed to 1 . 0 mg l ( - 1 ) TiO ( 2 ) ( both NP and bulk ) by the end of the 21 - d recovery period .
 Chemical: TiO ( 2 )
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: TiO ( 2 )