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
[{'content': 'Causes of nephrocalcinosis are -a)  Hyperparathyroidismb) TB Kidneyc)  Hypercalcemiad)  Glomerulonephritise)  MCD \nSelect and explain. \nA. acd, B. bcd, C. abc, D. abd', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]