This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolic Disorders, Subject name: Pediatrics
[{'content': 'Hypercalciuria is said to be present in children if daily calcium excretion in urine is more than: \nSelect and explain. \nA. 1 mg/kg, B. 2 mg/kg, C. 3 mg/kg, D. 4 mg/kg', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: d (4 mg/kg) Ref:Nelson, 17th ed, p. 1824, Table 539-1, 18th ed, p. 2184, Table 547-3Normal values of urine chemistry in childrenCalcium< 4.0 mg/kgOxalate< 0.57 mg/kgUric acid< 10.7 mg/kgCitrate> 2.0 mg/kgCysteinea) Heterozygote 1.4 - 2.8b) Homozygote >5.7Phosphate <15.0', 'role': 'assistant'}]