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
[{'content': 'Magnesium level in blood increases in- \nSelect and explain. \nA. Uncontrolled DM, B. Liver cirrhosis, C. Kidney failure, D. Chronic alcoholism', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]