question: A 2–year–old boy has vitamin D resistant rickets. Is investigations revealed serum Calcium–9 mg/ dl, Phosphate- 2.4 mg/dl, alkaline phospitatase–1041 IU, normal intact parathyroid hormone and bicarbonate 22 mEq/L. Which of the following is the most probable diagnosis –
opa: Distal renal tubular acidosis
opb: Hypophosphatemic rickets
opc: Vitamin D dependent rickets
opd: Hypoparathyroidism