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: Radiology
[{'content': 'Earliest evidence of healing in rickets is provided by- \nSelect and explain. \nA. S. Ca++, B. S. P043-, C. Radiological examination of growing bone ends, D. S Alkaline phosphate level', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The earliest evidence of healing rickets comes from radiographs of the growing ends of bones.\xa0Concentration of calcium and phosphorus in the plasma provide an inconstant and unreliable guide. A more constant change is a decrease in the plasma alkaline phosphatase, but this does not usually occur for several weeks after adequate treatment initiated.', 'role': 'assistant'}]