19105
Forty participants received 0 . 5 , 1 , 2 , or 4 mg zaleplon or placebo as a thermally generated aerosol in a randomized , double - blind , parallel - group , dose escalation study .
 Chemical: zaleplon
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: zaleplon 
Answer:
 Chemical: zaleplon