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Gentamicin which lacks 3 ' - hydroxyl group can avoid the attack from the modification enzymes of antibiotic - resistant bacteria in clinic .
 Chemical: Gentamicin; Chemical: 3 ' - hydroxyl
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: Gentamicin; Chemical: 3 ' - hydroxyl