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Ethambutol is an antimycobacterial agent often used to treat tuberculosis .
 Chemical: Ethambutol; Disease: tuberculosis
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: Ethambutol, tuberculosis 
Answer:
 Chemical: Ethambutol; Disease: tuberculosis