3554
Possible pathophysiological mechanisms which may have been operative in this case include : a direct central nervous system ( CNS ) toxic effect of valproic acid ; a paradoxical epileptogenic effect secondary to the drug ; and an indirect CNS toxic effect mediated through valproic acid - induced hyperammonemia .
 Chemical: valproic acid; Chemical: valproic acid; Disease: hyperammonemia
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:
 Chemical: valproic acid; Chemical: valproic acid; Disease: hyperammonemia