5407
Preincubating hMSC with Ptx prevented 90 % of the suppressive effect of As ( III ) .
 Chemical: As ( III )
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: As ( III ) 
Answer:
 Chemical: As ( III )