This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nephrotic and Nephritic syndrome, Subject name: Medicine
Which is a characteristic finding in AGN? 
Select and explain. 
A. Red blood cell cast, B. Hematuria, C. Proteinuria, D. Epithelial Cells
A: Red blood cell cast
Answer: A: Red blood cell cast 
Explanation: * RBC casts indicate glomerular bleeding and are seen with acute glomerulonephritis. * Hematuria can be seen with even kidney stones or bladder cancer and hence is not a characteristic finding of AGN.