20611
Testing for departures from additivity in mixtures of perfluoroalkyl acids ( PFAAs ) .
 Chemical: perfluoroalkyl acids; Chemical: PFAAs
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: perfluoroalkyl acids, PFAAs 
Answer:
 Chemical: perfluoroalkyl acids; Chemical: PFAAs