7237
Human alcohol dehydrogenases and aldehyde dehydrogenases ( ALDHs ) , the principal enzymes responsible for metabolism of ethanol , are complex enzyme families that exhibit functional polymorphisms among ethnic groups and distinct tissue distributions .
 Chemical: alcohol; Chemical: aldehyde; Chemical: ethanol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: alcohol; Chemical: aldehyde; Chemical: ethanol