7967
We used therapeutic drug monitoring to determine whether plasma concentrations of valproic acid were kept within the therapeutic window and to determine the amount of valproic acid that was removed by plasmapheresis .
 Chemical: valproic acid; Chemical: valproic acid
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: valproic acid, valproic acid 
Answer:
 Chemical: valproic acid; Chemical: valproic acid