This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolic and endocrine disorders, Subject name: Orthopaedics
[{'content': 'Z score measures the bone mineral density compred to - \nSelect and explain. \nA. Age, Race and sex matched individuals, B. Race and sex matched individuals, C. Sex matched individuals, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A Z-score compares your bone density to the average values for a person of your same age and gender. A low Z-score (below -2.0) is a warning sign that you have lessbone mass (and/or may be losingbone more rapidly) than expected for someone your age. Ref essential ohopaedic maheshwari and mhaskar 9TH ED', 'role': 'assistant'}]