17626
We also studied the response of the aldehydes when present in a mixture at relative concentrations as present in cigarette smoke .
 Chemical: aldehydes
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: aldehydes 
Answer:
 Chemical: aldehydes