This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Nephrocalcinosis in a systemic granuomatous disease is due to 
Select and explain. 
A. Over production of 1,25 dihydroxy vitamine D, B. Dystrophic calcification, C. Mutation in calcium sensing receptors, D. Increased reabsorption of calcium
A: Over production of 1,25 dihydroxy vitamine D
Answer: A: Over production of 1,25 dihydroxy vitamine D 
Explanation: Ref Robbins 8/e p 433-436 Nephrocalcinosis, once known as Albright's calcinosis after Fuller Albright, is a term originally used to describe deposition of calcium salts in the renal parenchyma due to hyperparathyroidism. The term nephrocalcinosis is used to describe the deposition of both calcium oxalate and calcium phosphate. It may cause acute kidney injury