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
Which one of the following biochemical measures would be most likely to be elevated in this patient? 
Select and explain. 
A. Alkaline phosphatase, B. Calcium, C. Ferritin, D. Phosphorus
A: Alkaline phosphatase
Answer: A: Alkaline phosphatase 
Explanation: 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.