<prompt>  A 10-year-old boy has a fracture of the femur. The biochemical evaluation revealed Hb 11.5 gmdl and ESR 18 mm 1 hour, serum calcium 12.8 mgdl, serum phosphorus 2.3 mgdl, alkaline phosphatase 28 KA units and blood urea 32 mgdl. Which of the following is the most probable diagnosis in his case?Nutritional ricketsRenal ricketsHyperparathyroidismSkeletal dysplasia 