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': 'Which of the following urinary findings is most characteristic of acute glomerulonephritis? \nSelect and explain. \nA. Proteinuria, B. Granular casts, C. Erythrocyte casts, D. Hyaline casts', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hematuria with dysmorphic RBCs, RBC casts, and protein excretion >500 mg/d is virtually diagnostic of glomerulonephritis. RBC casts form as RBCs that enter the tubule fluid and become trapped in a cylindrical mold of gelled Tamm-Horsfall protein.\nHarrisson’s Principles of Internal Medicine Ed 19 Pg 294', 'role': 'assistant'}]