This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Which of the following is the chief mineral of bone? \nSelect and explain. \nA. Calcium oxalate, B. Hydroxyapatite, C. Calcium carbonate, D. Calcite', 'role': 'user'}, {'content': "Answer: B \nExplanation: The inorganic or mineral component is mainly crystalline hydroxyapatite--Ca10(PO4)6(OH)2--along with sodium, magnesium, carbonate, and fluoride; approximately 99% of the body's calcium is contained in bone. Hydroxyapatite confers on bone the strength and resilience required by its physiologic roles. Type I collagen is the major protein, comprising 90-95% of the organic material. Ref: Keeley F.W., Murray R.K. (2011). Chapter 48. The Extracellular Matrix. In D.A. Bender, K.M. Botham, P.A. Weil, P.J. Kennelly, R.K. Murray, V.W. Rodwell (Eds), Harper's Illustrated Biochemistry, 29e.", 'role': 'assistant'}]