10878
Absorption and secretion of fluoride increase at acid pH levels , possibly because of its non - ionized state at these pHs and / or because of participation of a F ( - ) / H ( + ) cotransporter or a F ( - ) / OH ( - ) antiporter .
 Chemical: fluoride; Chemical: F ( - ); Chemical: H ( + ); Chemical: F ( - ); Chemical: OH ( - )
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: F ( - ); Chemical: H ( + ); Chemical: F ( - ); Chemical: OH ( - )