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Sixty Sprague - Dawley rats were divided randomly into three groups of 20 each , that is , the untreated control group ( drinking water naturally containing < 0 . 5 mg fluoride / l , NaF ) , the low - fluoride group ( whose drinking water was supplemented with 10 mg fluoride / l ) and the high - fluoride group ( 50 mg fluoride / l ) .
 Chemical: fluoride; Chemical: NaF; Chemical: fluoride; Chemical: fluoride; Chemical: fluoride; Chemical: 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: fluoride; Chemical: NaF; Chemical: fluoride; Chemical: fluoride; Chemical: fluoride; Chemical: fluoride