19416
This report is the first one to present a patient with ARDS in relation to long - standing exposure to a high - concentration mixture of ethenone and crotonaldehyde .
 Chemical: ethenone; Chemical: crotonaldehyde
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: ethenone, crotonaldehyde 
Answer:
 Chemical: ethenone; Chemical: crotonaldehyde