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
[{'content': 'Causes of Hypocalcemia in a child are- \nSelect and explain. \nA. DiGeorge syndrome, B. Hypoparathyroidism, C. Magnesium deficiency, D. All of above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Causes of hypocalcemia \n\nHypoparathyroidism\nDiGeorge syndrome\nPTH receptor defect (pseudohypoparathyroidism)\nMagnesium deficiency\nExogenous organic phosphate excess\nVit D difecideciency', 'role': 'assistant'}]