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
Renal osteodystrophy differs from nutritional and metabolic rickets due to the presence of: 
Select and explain. 
A. Hyperphosphatemia, B. Hypercalcemia, C. Hypophosphatemia, D. Hypocalcemia
A: Hyperphosphatemia
Answer: A: Hyperphosphatemia 
Explanation: None