ANS:B - calcium phosphate

The main component of bone ash is calcium phosphate. Bone ash is produced by calcining (heating to high temperatures) animal bones, typically from cattle. During the calcination process, organic matter in the bones is burned off, leaving behind primarily calcium phosphate in the form of hydroxyapatite [Ca10(PO4)6(OH)2], which is the main mineral component of bones and teeth. So, the correct option is: calcium phosphate calcium phosphate