This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Pediatrics
Preterm VLBW infants ingesting unfortified breast milk need to be supplemented with what doses of calcium, and vitamin D? 
Select and explain. 
A. Calcium (80-120 mg/kg/day) and vitamin D (200-400 IU/day), B. Calcium (40-80 mg/kg/day) and vitamin D (400-1000 IU/day), C. Calcium (500-1000 mg/kg/day) and vitamin D (200-400 IU/day), D. Calcium (150-220 mg/kg/day) and vitamin D (200--400 IU/day)
D: Calcium (150-220 mg/kg/day) and vitamin D (200--400 IU/day)
Answer: D: Calcium (150-220 mg/kg/day) and vitamin D (200--400 IU/day) 
Explanation: d. Calcium (150-220mg/kg/day) and vitamin D (200-400IU/day)(Ref: AAP recommendations, 2013)As per the latest AAP Recommendations for Enteral Nutrition for VLBW Infants, a daily Calcium intake of 150-220mg/kg, Phosphate 75-140mg/kg & Vitamin D 200-400IU should be ensured