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
Hypocalcemia in child -All except? 
Select and explain. 
A. Digeorge syndrome, B. Hypo parathyroidism, C. Magnesium deficiency, D. All of above
D: All of above
Answer: D: All of above 
Explanation: Ans. is 'd' i.e., All of above Causes of hypocakemia Hypo parathyroidism Digeorge syndrome PTH receptor defect (pseudo hypoparathyroidism) Magnesium dificiency Exogenous organic phosphate excess Vit D difeciency