Correct Option: A

Our bones and teeth are generally made up of Tricalcium Phosphate. Tricalcium phosphate is a calcium salt of phosphoric acid with the chemical formula Ca₃(PO₄)₂. It is also known as tribasic calcium phosphate and bone phosphate of lime, BPL. Calcium phosphate is one of the main combustion products of bone. The skeletons and teeth of vertebrate animals are composed of calcium phosphate.