28344
In this study , 30 Wistar rats were randomly divided into three groups : a control group , a sodium fluoride ( NaF ) + EGb group , and a NaF group .
 Chemical: sodium fluoride; Chemical: NaF; Chemical: NaF
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: sodium fluoride; Chemical: NaF; Chemical: NaF