26600
Treatment groups included control , Spirulina alone , sodium fluoride ( 20mg / kg ) alone , and sodium fluoride along with Spirulina ( 250 and 500mg / kg ) .
 Chemical: sodium fluoride; Chemical: sodium fluoride
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: sodium fluoride