What is the gold standard for the diagnosis of osteoporosis?
ADual energy X-ray absorptiometry
BSingle energy X-ray absorptiometry
CUltrasound
DQuantitative computed tomography
Which vitamin deficiency is most commonly associated with rickets in children?
AVitamin A
BVitamin C
CVitamin D
DVitamin K
A child presents with rachitic changes in the limbs that are not responding to Vitamin D supplementation. Investigations reveal the following results: - Calcium: $9.5 \mathrm{mg} / \mathrm{dl}$ - Phosphorus: $1.6 \mathrm{mg} / \mathrm{dl}$ - Alkaline phosphatase (ALP): 814 IU - Serum PTH: $24.2 \mathrm{pg} / \mathrm{ml}$ - Serum electrolytes, creatinine, and blood gases: Normal. What is the most likely diagnosis?
AHypophosphatemic rickets
BVitamin D-dependent rickets type 2
CVitamin D-dependent rickets type 1
DChronic renal failure
EVitamin D deficiency rickets
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