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: Surgery
[{'content': 'Low and fixed specific gravity of urine is seen in ? \nSelect and explain. \nA. Diabetes mellitus, B. Diabetes insipidus, C. Chronic renal failure, D. Acute glomerulonephritis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans is 'c' i.e., Chronic renal failure.", 'role': 'assistant'}]