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: Medicine
[{'content': 'Renal osteodystrophy differs from nutritional and metabolic rickets due to the presence of: \nSelect and explain. \nA. Hyperphosphatemia, B. Hypercalcemia, C. Hypophosphatemia, D. Hypocalcemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]