This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'Which one of the following biochemical measures would be most likely to be elevated in this patient? \nSelect and explain. \nA. Alkaline phosphatase, B. Calcium, C. Ferritin, D. Phosphorus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer A. Alkaline phosphataseThe patient has genu varum and enlarged wrists consistent with nutritional rickets. Alkaline phosphatase usually is increased markedly over the age-specific reference range in rickets. Serum phosphorus and vitamin D concentrations are usually low; serum calcium concentration is decreased only in hypocalcemic rickets. Ferritin is not usually elevated in these patients.', 'role': 'assistant'}]