1152
PURPOSE : To map and identify the pattern , in vivo , of axonal degeneration in ethambutol - induced optic neuropathy using optical coherence tomography ( OCT ) .
 Disease: axonal degeneration; Chemical: ethambutol; Disease: optic neuropathy
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: axonal degeneration; Chemical: ethambutol; Disease: optic neuropathy