2681
The present experiments were performed to study the effect of the flavonoid apigenin ( 20 mg / kg intraperitoneally ( i . p . ) , 1 h before acquisition ) , on 24 h retention performance and forgetting of a step - through passive avoidance task , in young male Wistar rats .
 Chemical: flavonoid; Chemical: apigenin
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: flavonoid; Chemical: apigenin