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: Surgery
[{'content': 'The tensile strength of a bone is due to - \nSelect and explain. \nA. Strands of collagen, B. Hydroxyapatite crystals, C. Periosteum, D. Metaphysis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Strands of collagenThe strands of collagen give bone its tensile strength, and the interspersed crystals of hydroryapatite give bone its compressional strength. These effects are synergistic.', 'role': 'assistant'}]