The conversion of hydroxyapatite occurs due to the presence of $F^{-}$ ions in water. The correct formula of hydroxyapatite is:
- A$[3 Ca_{3}(PO_{4})_{2} \cdot Ca(OH)_{2}]$
- B$[3 Ca(OH)_{2} \cdot CaF_{2}]$
- C$[Ca_{3}(PO_{4})_{2} \cdot CaF_{2}]$
- D$[3 Ca_{3}(PO_{4})_{2} \cdot CaF_{2}]$
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