2720
Inhibition of neurite outgrowth and alteration of cytoskeletal gene expression by sodium arsenite .
 Chemical: sodium arsenite
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: sodium arsenite 
Answer:
 Chemical: sodium arsenite