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
Hypocalcemia with hyperphosphatemia are seen in-a) CRFb) Pseudohypoparathyoidsmc) Vit-D deficiencyd) Magnesium deficiency 
Select and explain. 
A. ab, B. a, C. ad, D. bc
A: ab
Answer: A: ab 
Explanation: None