Dental Organic content of supragingival calculs: A Hydroxyapatite crystal + octacalcium phosphate. B Hydroxyapatite crystal + Magnesium whit lockite. C Hydroxyapatite crystal +Brushite. D Hydroxyapatite crystal + Calcium phosphate. 💡 Explanation Organic content of supragingival calculs: ✓ Correct Answer: A. Hydroxyapatite crystal + octacalcium phosphate.