This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
In all of the following conditions myopathy is seen, EXCEPT: 
Select and explain. 
A. X-linked hypophosphatemic ricket, B. Oncogenic osteomalacia, C. Nutritional osteomalacia, D. Cushing syndrome
A: X-linked hypophosphatemic ricket
Answer: A: X-linked hypophosphatemic ricket 
Explanation: X-linked hypophosphatemia (XLH), formerly called vitamin D-resistant rickets, is characterized by renal phosphate wasting, hypophosphatemia, and decreased 1,25 (OH) 2D production relative to the degree of hypophosphatemia. In contrast to the hypocalcemic varieties of rickets, this condition is not associated with dental enamel hypoplasia or proximal myopathy. Ref: Differential diagnosis in internal medicine: from symptom to diagnosis edited by Walter Siegenthaler, 2007, Page 373.