Hydroxyapatite constitutes

Bone

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Cartilage

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Teeth

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Both A and C

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Solution

The correct option is D Both A and C
Hydroxyapatite constitutes of calcium- and phosphorus- containing compound mineral which is present bulky in the structure of bones and teeth. In teeth, hydroxyapatite is soluble in the acids of soft drinks or carbohydrate fermentation, but when it combines with the fluoride ions present in fluoridated water or fluoride toothpaste later it becomes decay-resistant fluoroapatite.
So, the correct answer is option D.

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