27504
Experimental animals were divided into a control group , a sodium fluoride - treated group ( NaF , 50 mg / L ) , three sodium selenite - treated groups ( Na2SeO3 , 0 . 375 , 0 . 75 , and 1 . 5 mg / L ) , and three selenium + NaF - treated groups ( Na2SeO3 , 0 . 375 , 0 . 75 , and 1 . 5 mg / L ; NaF , 50 mg / L ) .
 Chemical: sodium fluoride; Chemical: NaF; Chemical: sodium selenite; Chemical: Na2SeO3; Chemical: selenium; Chemical: NaF; Chemical: Na2SeO3; 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: sodium selenite; Chemical: Na2SeO3; Chemical: selenium; Chemical: NaF; Chemical: Na2SeO3; Chemical: NaF