5408
Selective competitive antagonists of Gi - coupled endothelin - 1 type A and B receptors were ~ 60 % effective in blocking As ( III ) inhibition and combination of antagonists to both receptors were 85 % effective .
 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 )