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
Nephrocalcinosis is a feature of A/E: 
Select and explain. 
A. Primary hyperparathyroidism, B. Medullary sponge kidney, C. Vitamin D intoxication, D. Pseudo hypoparathyroidism
D: Pseudo hypoparathyroidism
Answer: D: Pseudo hypoparathyroidism 
Explanation: Answer is D (Pseudohypoparathyroidism): Primary hyperparathyroidism. Medullary Sponge Kidney and Vitamin D excess are established causes. for nephrocalcinosis.