26982
After 24h exposure , the cell number increased by 32 . 2 % at an exposure level of 3mg / L Fe3O4 NPs .
 Chemical: Fe3O4
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: Fe3O4 
Answer:
 Chemical: Fe3O4