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: Medicine
[{'content': 'Hypocalcemia with hyperphosphatemia are seen in-a) CRFb) Pseudohypoparathyoidsmc) Vit-D deficiencyd) Magnesium deficiency \nSelect and explain. \nA. ab, B. a, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]