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
A child with recurrent muscle cramps and spams On analysis there is hypokalemia , metabolic alkalosis , hypocalciuria but increased urinary magnesium . What is the most probable diagnosis ? 
Select and explain. 
A. Bartter syndrome, B. Gittelman syndrome, C. Liddle syndrome, D. None of the above
B: Gittelman syndrome
Answer: B: Gittelman syndrome 
Explanation: Gittelman syndrome  :
Defect in Na-Cl co-transporter.
Hypokalemic metabolic alkalosis.
Hypocalciuria - No stones in urine.
Hypomagnesemia due to ↑ urinary magnesium.