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 seen in 
Select and explain. 
A. Medullary sponge disease, B. Acute pyelonephritis, C. Acute glomerulonephritis, D. Chronic pyelonephritis
A: Medullary sponge disease
Answer: A: Medullary sponge disease 
Explanation: Answer is A (Medullary sponge kidney) Medullary sponge kidney and Hyperparathyroidism are established causes ofNephrocaleinosis.