20071
The three NaF treated groups received 100 , 150 , and 200ppm , respectively , of NaF for 6months via their drinking water , while the control group ( GC ) received distilled water .
 Chemical: NaF; Chemical: NaF
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: NaF, NaF 
Answer:
 Chemical: NaF; Chemical: NaF