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: Pathology
Causes of nephrocalcinosis are -a)  Hyperparathyroidismb) TB Kidneyc)  Hypercalcemiad)  Glomerulonephritise)  MCD 
Select and explain. 
A. acd, B. bcd, C. abc, D. abd
C: abc
Answer: C: abc 
Explanation: None