8900
Perfluorooctane sulfonate ( PFOS ) is a man - made fluorosurfactant and global pollutant .
 Chemical: Perfluorooctane sulfonate; Chemical: PFOS
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: Perfluorooctane sulfonate, PFOS 
Answer:
 Chemical: Perfluorooctane sulfonate; Chemical: PFOS