5391
Moreover , BDNF levels in the two brain regions were also elevated by chronic oleanolic acid treatment ( frontal cortex : 20 mg / kg , 67 . 2 % ; hippocampus : 10 mg / kg , 36 . 4 % ; 20 mg / kg , 55 . 1 % ) .
 Chemical: oleanolic acid
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: oleanolic acid 
Answer:
 Chemical: oleanolic acid