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A major class of chemicals found in tobacco smoke is formed by aldehydes , in particular formaldehyde , acetaldehyde and acrolein .
 Chemical: aldehydes; Chemical: formaldehyde; Chemical: acetaldehyde; Chemical: acrolein
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, formaldehyde, acetaldehyde, acrolein 
Answer:
 Chemical: aldehydes; Chemical: formaldehyde; Chemical: acetaldehyde; Chemical: acrolein