The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 2 year old boy has vitamin D refractory rickets. Investigations show serum calcium 9 mg/dl. Phosphate 2.4 mg dl, alkaline phosphate 1040 parathyroid hormone and bicarbonate levels are normal. The most probable diagnosis is –   (A) Distal renal tubular acidosis   (B) Hypophosphatemic rickets.   (C) Vitamin D dependent rickets   (D) Proximal renal tubular acidosis
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