1970
This study investigated the visual defects associated with the antiepileptic drug vigabatrin ( VGB ) .
 Disease: visual defects; Chemical: vigabatrin; Chemical: VGB
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: visual defects; Chemical: vigabatrin; Chemical: VGB