28733
[ Sikora A . < i > et al . , Chem Res Toxicol < / i > 24 , 687 - 97 ] .
 None
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:  
Answer:
 None