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: Orthopaedics
[{'content': 'Major mineral of the bone is - \nSelect and explain. \nA. Calcite, B. Hydroxyapatite, C. Calcium oxide, D. Calcium carbonate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Inorganic component of bone is consists of mineral phase which is principally composed of calcium and phosphate, mostly in the form of hydroxyapatite .', 'role': 'assistant'}]